31. They often play soccer, table tennis, badminton or swimming

32. They sometimes go swimming

33. In the school music room

34. They usually rehearse plays

35. They often get together and talk about their stamps

36. Yes, most of them enjoy their activities after school hours

lớp mấy vậy

\(i=90^o-60^o=30^o\\ \\ i=i'\Leftrightarrow i'=30^o\)

D

Đáp án là D nhé bn 

B

B

B

T - T - T - NI - F

A

A

A

C

B

21. A
22. A
23. A
24. C
25. B

21.B

22.A

23.C

24.B

25.D

21. B

22. A

23. C

24. B

25. D

C

C

Đáp án C

Chúc bạn học tốt <3

A

A

A.30 độ

B

B

B