14. ______ you are leaving tomorrow, we can eat dinner together tonight. A. For B. Since C. Before D. While ...

4. The overall goal of the book is to help bridge the gap between research and teaching. A. 错误 B. 正确 ...

19. By the time he arrives in Beijing, we _____ here for two days. A. have been staying B. have stayed C. shall stay D. will have stayed ...

14. In Disneyland, every year, some 800,000 plants are replaced because Disney refused to ______ signs asking his guests not to step on them. A. put down B. put out C. put up D. put off ...

9. He soon received promotion, for his superiors realized that he was a man of considerable ______. A. ability B. future C. possibility D. opportunity ...

9. Since the temperature falling so rapidly, we couldn't go on with the experiment. A. 错误 B. 正确 ...

4. Although a teenager, Fred could resist being told what to do and what not to do. A. 错误 B. 正确 ...

19. I'm very sorry to have ______ you with so many questions on such an occasion. A. interfered B. offended C. impressed D. bothered ...

9. To our _____, Geoffrey's illness proved not to be as serious as we had feared. A. anxiety B. relief C. view D. judgment ...

9. As long as he is still working on the project, I don't mind when he will finish it. A. 错误 B. 正确 ...