-----Alice, you clean the blackboard today, _________?
----- But I cleaned it yesterday.
| A．won’t you | B．will you | C．didn’t you | D．don’t you |
There is no need ______ because Mr. Smith is still sleeping.
| A．hurry | B．hurrying | C．to hurry | D．hurried |
Mr Smith, _____ of the _____ speech, started to read a novel.
| A．tired; boring | B．tiring; bored | C．tired; bored | D．tiring; boring |
She thought I was praising her son, _____ as a matter of fact, I was scolding him for his bad behavior at school.
| A．while | B．therefore | C．which | D．so that |
The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.
| A．to be; have fallen | B．to have been; to have fallen |
| C．to be; to fall | D．having been; having fallen |
The goods on this counter ____ at a discount of 25%, like the typewriters, television receivers, dustbins, etc.
| A．sell | B．sells | C．is sold | D．are sold |