Question

Answer 1

15 A

16 B

17 A

18 A

19 listening 

20 went

21 are doing

Answer 2

15. A (played)

16. hok bt A hay B

17. A (don't)

18. A (many)

Answer 3

15-A

16-A

17-B

18-A

19-listen

20-went

21-are doing

Answer 4

15 A

16 B

17 A

18 A

19 listening 

20 went

21 are doing

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