Ladies and gentlemen，please fasten your seat belts．The plane ．
| A．takes off | B．took off |
| C．is taking off | D．has taken off |
34. --- I think I’ll give Bob a ring.
--- You _______. You haven’t been in touch with him for ages.
| A．will | B．may | C．have to | D．should |
33. There's no light on - they______ be at home.
| A．can't | B．mustn't | C．needn't | D．shouldn't |
32. 一You were brave enough to raise objections at the meeting．
一 Well, now I regret_________ that．
| A．to do | B．to be doing | C．to have done | D．having done |
31. The chair looks rather hard，but in fact it is very comfortable to________.
| A．sit | B．sit on | C．be sat | D．be sat on |
30. Wang Tao was made_______ the dishes for a week as a punishment．
| A．to wash | B．washing | C．wash | D．to be washing |