第三节语法和词汇知识（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。
11.Will you drop in at my house this afternoon if ?
A.it is convenient to you B.you are convenient
C.it is convenient of you D.you will be convenient
12. ______ I toured Zhangjiajie, I was deeply impressed with its beautiful scenery.
A. For the first time B. At first C. It was the first time D. The first time
13. Every minute is made full use of ___ our lessons.
A. to study B. studying C. studied D. study
14. I can’t stand ___ with Jane in the office. She just refuses ___ talking while she works.
A. working; stopping B. to work; stopping C. working; to stop D. to work; to stop
15. They demand that the library ______ open during the vacation.
A. must be kept B. is kept C. would be kept D. be kept
16.Not until he failed the exam，______ he ______ he wasted too much time playing.
A. do; realize B. did; realize C. has; realize D. /; realized
