A.isn’t she B.isn’t it C.aren’t they D.isn’t he

27.I told Sally how to get here,but perhaps I________for her.

A.had to write it out B.must have written it out

C.should have written it out D.ought to write it out

28.-Can I help you,sir?

-Yes,I bought this radio here yesterday,but it______.

A.didn’t work B.couldn’t work C.can’t work D.doesn’t work

29.-Shall I tell John about it?

-No,you_________.I’ve told him already.

A.needn’t B.wouldn’t C.mustn’t D.shoudn’t

30.Where is my pen? I_____it.

A.should have lost B.must have lost C.would have lost D.might lose

31.-Why didn’t you answer when I called you?