( )16. - Listen! Is that Kangkang playing the guitar?
- No, it ________be Kangkang. He has gone to Chengdu.
A. can’t B. needn’t C. mustn’t
( )17. -Don’t ________ too late, or you’ll be tired tomorrow. -I won’t, Mum.
A. stay up B. wake up C. get up
( )18. Mum often asked us _______ games too much because it's a waste of time.
A. to play B. not to play C. to not play
( )19. -Have you seen the film Harry Potter? –Yes. I ________ it last year.
A. seen B. see C. saw
( )20. There are many volunteers ________ are helping the children in Sichuan.
A. which B. whose C. who
