_______ his foot wounded so seriously, he had to give up this basketball game.
| A．For | B．When | C．With | D．While |
Great changes ______ in China in the past 20 years.
| A．took place | B．have taken place | C．were taken place | D．have been taken place |
The question is ______ it is worth doing.
| A．if | B．whether | C．which | D．what |
---Would you mind my sitting here ____ lunch? ---______.
A. and have, No, not at all C. and having, No, thank you.
C. to have, Never, go ahead. D. and have, Oh, it’s my pleasure.
It was rude ______ you to stare at the foreigner when he passed by just now.
| A．of | B．for | C．with | D．to |
—Where is Bob? I cannot find him anywhere.
—He have been off long. I heard him make a call 
just now.
| A．shouldn’t | B．can’t | C．mustn’t | D．needn’t |