15, It’s time you stopped smoking.

16, I’d rather you not make noise.

17, We wish you were not always running about.

18, I wish the window was not scratched by the cat.

19, I wish the song you are singing was not boring.

20, We wish the neighborhood we are living in was not bad.

12, education

13, optional

14, happily

15, compulsory

16, Luckily

17, proud

18, pride

19, correspondent

20, instruction

V

31, Vietnam belongs to ASEAN, which consists of eleven countries.

VI

33, She used to swim when she was 15.

34, It would be better for you to start revising the lessons carefully.

35, We wish that we were as free as birds.

36, They’d prefer you stop chatting online overnight.