第二部分英语知识运用（共两节，满分45分）
第一节 单项填空（共15小题；每小题1分,满分15分）
从 A、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. —Would you mind if I sat here?
— Sorry. _____ I'm expecting a friend.
a.Of course not. B. I'd rather you didn't C. Go ahead. D. Why not?
We are in a difficult position in____ we have nobody properly qualified for this work.
| A．that | B．when | C．what | D．where |
I have no one ____ me, for I can deal with it all by myself.
| A．to help | B．to have helped | C．help | D．helped |
______ important thing in life is to have a great aim, and ______ determination to attain it.
| A．An ; 不填 | B．A ; the | C．The ; the | D．The ; 不填 |
In China, the number of cities is increasing ______ development is recognized across the world.
| A．where | B．which | C．whose | D．that |
---I’m going to San Francisco for a couple of days.
---_________. I wish I could get away for a while.
| A．It doesn’t matter | B．I can’t agree more | C．I really envy you | D．Forget it |