They must have been enjoying themselves there，or they __________ so long．
| A．wouldn’t stay | B．needn’t have stayed |
| C．wouldn’t have stayed | D．couldn’t stay |
______ which school was suitable for their son, the parents visited lots of different primary schools in the city.
| A．Finding | B．Being found |
C．Found | D．To find |
It is best to eat three meals a day; otherwise, it is possible____ your health will suffer later in life.
| A．that | B．when |
C．while | D．as |
—I have telephoned him twice but I couldn’t get through.—I think that the line _____ be being worked on today.
| A．should | B．might |
C．need | D．would |
They must have gotten to the top of the mountain by now. They_____ before the sun rose.
| A．settled down | B．set out |
C．took off | D．turned up |
—Lucy, go do the washing please.—_______ I just did it yesterday.
| A．It’s your turn. | B．It’s up to you. |
C．So what? | D．With pleasure. |