Answers
1. Music key
2. In the dictionary
3. In the mouth
4. Because it is the middle of the day
5. One powders the face anf the other faces the powder
6. The promise
7. Today
8. Letter M (What comes twice in a month, once in a minutes ang never in a hundred year)
9. A hole
10. Letter C (the sea)
11. Fire
12. Because it is the middle of the water
13. The word short become shorter by the addition of a syllable
14. Your name
15. An umbrella
16. Smoke, your age
17. Heat, because you can catch cold
18. A and B, because you say: ABCD (AB see D)
19. O, I, C, U (oh, I see you)
20. Your word
P/s : Tick mình nha bạn