Three hundred firemen raced to the hotel after a smoke detector(检测器)_____ the alarm soon after midnight.
| A．set out | B．set off | C．give away | D．give off |
I was told that there were about 50 foreign students __________Chinese in the school, most __________were from America.
| A．study；of whom | B．study；of them | C．studying；of them | D．studying；of whom |
I __________use a clock to wake me up because at six o'clock each morning the train comes by my house.
| A．couldn’t | B．mustn’t | C．shouldn’t | D．needn’t |
Would you please keep silent? The news that the milk contains a harmful chemical _________and I want to listen.
| A．has been broadcast | B．is being broadcast | C．is broadcast | D．is broadcasting |
The kid, rather than his parents, __________said to have had an accident while travelling.
| A．is | B．are | C．were | D．will be |
―Are you satisfied with what she has done?
―Not a little. It can’t be ________.
| A．any worse | B．any better | C．so well | D．so bad |