17. I failed in the final examination last term and only when I knew the result ____________________ (我认识到) the importance of studies.　 (realize)

16. ________________________________________(有许多难题要解决)，the newly-elected mayor is having a hard time. (with)

15. He _____________________________(现在正忙于) preparing for the coming examination. (engage)

14. ______________________________(一样) many others, she applied for a training.( common)

13. Professor, who will win the debate on _______________(是否应该允许克隆人类)?(allow)

12. She wished to spend the holiday simply _____________________________(呆在家里听音乐). (stay)

11. He ________________________________________(通晓) Chinese history.　 (knowledge)

20. The number of people ____________________________(邀请参会的) was over fifty, but a number of them were absent for some reasons. (invite)

专题训练 (24)

19. When _____________________________ (干杯) someone’s health, you raise your glasses, but the glasses should not touch. (drink)

18. These beautiful flowers should be watered ________________________(每隔一天) . (every)