第二部分知识运用 (共两节，满分20分)
第一节单项填空（共10小题；每小题1分，满分10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. When Li Lei was a small child, he hoped to be ______ policeman after he grew up and finally his dream came true.
A. a B. an C. the D. 不填
The mother who lost her son insisted that the careless driver for the traffic accident ___ yesterday .
| A．was to blame ; happening | B．be to blame ; happened |
| C．be blamed ; was happened | D．was to blame; had happened |
I usually don’t wake up until my alarm _______ every morning.
| A．switches off | B．gives up | C．puts up | D．goes off |
It was after careful consideration ________we decided to take action.
| A．which | B．that | C．why | D．when |
Eventually, the President had to leave office_____ public pressure in order to ease the tension of the situation.
| A．in favor of | B．in response to | C．in return for | D．in honour of |
We will be free tomorrow, so I suggest ________ to the history museum.
| A．to visit | B．visiting | C．we should visit | D．a visit |