diff --git a/docs/.vitepress/theme/components/TTS.vue b/docs/.vitepress/theme/components/TTS.vue
index 6f829ea..ba7c24f 100644
--- a/docs/.vitepress/theme/components/TTS.vue
+++ b/docs/.vitepress/theme/components/TTS.vue
@@ -5,7 +5,9 @@
     </span>
     <audio style="display: none" ref="audio"></audio>
     <span>
-      <button type="button" @click="playAudio()">🗣️</button>
+      <button type="button" @click="playAudio()" :class="$style.speak">
+        🗣️
+      </button>
     </span>
   </span>
 </template>
@@ -76,4 +78,9 @@ async function playAudioTTSPlugin(): Promise<boolean> {
 }
 </script>
 
-<style module></style>
+<style module>
+.speak {
+  text-align: center;
+  width: 2em;
+}
+</style>
diff --git a/docs/howtostudykorean/unit-1/12-more-particles.md b/docs/howtostudykorean/unit-1/12-more-particles.md
index 6d8f003..8b2b757 100644
--- a/docs/howtostudykorean/unit-1/12-more-particles.md
+++ b/docs/howtostudykorean/unit-1/12-more-particles.md
@@ -513,6 +513,97 @@ vocabulary:
       examples:
         - ko: 저는 2**층**에서 살아요
           en: I live on the second **floor**
+
+sentence:
+  no_subject:
+    - ko: 아침식사를 안 먹었어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-1.mp3
+      en: I didn’t eat breakfast
+
+  들:
+    - ko: 나는 사과를 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/11/Lesson-12-s1.mp3
+      en: I bought an apple **OR** I bought apples
+    - ko: 나는 사과 **한 개**를 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/11/Lesson-12-s2.mp3
+      en: I bought **one** apple
+    - ko: 나는 사과 **몇 개**를 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-4.mp3
+      en: I bought **SOME** apples
+
+    - ko: 나는 **몇 개**의 펜을 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-5.mp3
+      en: I bought **some** pens
+    - ko: 나는 **몇 명**의 사람을 만났어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-6.mp3
+      en: I met **some** people
+    - ko: 나는 학교에 **몇 번** 갔어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-7.mp3
+      en: I went to school **a few** times
+      notes: 번 _acts as an adverb – so it doesn’t need a particle to be attached to it
+
+    - ko: 의사들은 돈이 **많아**
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-8.mp3
+      en: doctors have **a lot of** money
+    - ko: 선생님은 내일 **학생들**을 만날 거야
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-9.mp3
+      en: The teacher will meet the **students** tomorrow
+    - ko: 배우들은 **그들의*** 영화를 보통 좋아하지 않아
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-10.mp3
+      en: actors usually don’t like **their** movies
+
+  만:
+    - ko: 나는 물**만** 마셔
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-11.mp3
+      en: I **only** drink water
+
+    - ko: 나**만** 그 여자를 좋아해
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-12.mp3
+      en: "**Only** I like that girl"
+    - ko: 나는 그 여자**만** 좋아해
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-1.mp3
+      en: I **only** like that girl
+
+    - ko: 나**만** 사과를 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-14.mp3
+      en: "**Only** I bought apples"
+    - ko: 나는 사과**만** 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-15.mp3
+      en: I **only** bought apples
+
+    - ko: 나는 사과 **한 개만** 샀어
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-16.mp3
+      en: I **only bought 1** apple
+    - ko: 저는 차 **두 대만** 있어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-3.mp3
+      en: I **only have two** cars
+    - ko: 저는 친구 **한 명만** 만났어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-4.mp3
+      en: I **only met one** friend
+
+    - ko: 저는 공부**만** 했어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-19.mp3
+      en: I **only** studied
+    - ko: 저는 어제 일**만** 했어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-20.mp3
+      en: Yesterday, I **only** worked
+
+  에만:
+    - ko: 우리는 학교**에만** 갔어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-5.mp3
+      en: We **only** went **to** school
+    - ko: 학생들은 교실 안**에만** 있어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-6.mp3
+      en: The students are **only in** their classrooms
+    - ko: 저는 밤**에만** 운동해요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-7.mp3
+      en: I exercise **only at** night
+    - ko: 저는 커피를 낮**에만** 마셔요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-8.mp3
+      en: I drink coffee **only during** the day
+    - ko: 저는 그 여자를 **그때만** 사랑했어요
+      audio: https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-9.mp3
+      en: I loved her **only at that time**
 ---
 
 # Lesson 12: Korean Particles 들, 만, 에서, 부터, 까지, (으)로
@@ -1306,6 +1397,8 @@ You can download all of these files in one package [here](https://www.howtostudy
 
 As of now, you have learned a few different Korean particles. The particles you have learned so far are: 는/은, 이/가, 를/을, 의 and 도. There are many more particles that you will need to learn – and this lesson will cover a lot of them. In this lesson, you will learn about ~들, ~만, ~에서, ~부터, ~까지 and ~(으)로! Let’s get started!
 
+<VocabQuiz fm-key="sentence" />
+
 ### An Important Note: Eliminating the Subject
 
 One thing that I have yet to tell you is that Korean people often omit the topic/subject of the sentence – especially when the topic/subject is ‘I.’ Korean people love making their sentences as short as possible, and this is one additional way of doing it. In most cases, when the subject/topic can be inferred by the situation, Korean people drop it entirely from the sentence. For example, instead of saying:
@@ -1320,6 +1413,8 @@ Both are perfect sentences and both can be used, but you should be aware that Ko
 
 ## Korean Particle ~들 and using 몇 with a counter
 
+<VocabQuiz fm-key="sentence" category="들" />
+
 You have probably been asking yourself ‘how can I make something plural?’ Up to now, I haven’t mentioned anything about plural words in Korean. The reason for this is Korean people rarely distinguish between singular and plural. For example, if I say:
 
 - 나는 사과를 샀어 <AudioButton src="https://www.howtostudykorean.com/wp-content/uploads/2015/11/Lesson-12-s1.mp3" />
@@ -1354,6 +1449,8 @@ Instead, ~들 is usually only attached to the word “person” (사람) or othe
 
 ## Korean Particle ~만 (only)
 
+<VocabQuiz fm-key="sentence" category="만" />
+
 The particle ~만 is very common and has the meaning of “<span class="md spoiler">only</span>.” It can be attached directly to the end of a noun to express “only (that noun).” For example:
 
 - 나는 물만 마셔 <AudioButton src="https://www.howtostudykorean.com/wp-content/uploads/2017/03/Lesson12-11.mp3" /> = <span class="md spoiler">I only drink water</span>
@@ -1409,6 +1506,8 @@ The examples above show ~만 attached to nouns, but really it can be attached to
 
 When ~만 gets attached to more complicated things, it usually doesn’t replace something, but overlaps it. What I mean is, when ~만 is attached to the subject or object, ~을/를 or ~은/는 get eliminated. However, when ~만 is attached to something else, everything usually stays in place.
 
+<VocabQuiz fm-key="sentence" category="에만" />
+
 I’ll show now how it can be attached to the ~에 particle we’ve covered, and follow up in later lessons with other particles.
 
 - 우리는 학교에만 갔어요 <AudioButton src="https://www.howtostudykorean.com/wp-content/uploads/2015/02/Lesson-12-sentence-5.mp3" /> = <span class="md spoiler">We only went to school</span>