第二部分：英语知识运用(共两节，满分25分)
第一节：单项填空(共10小题；每小题l分，满分l0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。
16. ---Will you help me with this mathematical problem? .
---Sure. Let me see.
A. It’s your turn B. Go on C. I’m stuck D. See what I mean?
17. We on it for several hours but we haven't yet reached any conclusion.
A. are working B. work C. have been worked D. have been working
18. , he dialed 999.
A. Seen the house on fire B. To see the house on fire
C. Being seen the house on fire D. Seeing the house on fire
