21．___ annoys me is that Kirn never returns the books she borrows on time.

　　 A．This　　　 　　　　　 B．It　　　　　 　　 C．What　 　　　　　　　 D．That

6．他能及时实施他的计划的可能性很小。

　 　　　　　that he can　　　 　　　　　　his plan in time are very small.

5．总体上说，我们必须依靠政府来防止我们的环境受到污染。

　 　　　　　a 　　　　　, we must depend on our government to 　　　　　our environment

　　　　　 　　　　　　　polluted.

4．他给公司挽回了损失，作为回报，公司给了他一间公寓。

　 He saved a lot for the company; the company gave him a flat 　　　　　.

3．现在很多人用电子邮件来替代信件，这表明越来越多的人使用电脑了。

　 Nowadays many people ___ letters ___ emails, which shows the wide use of the computer.

2．总经理生病去世后，他唯一的女儿接管了他的生意。

　 After the general manager fell ill and died, his only daughter ____ ____ the business　 ____him.

1．尽管他时不时去做兼职，他在学习上还是取得了很大进步，因为他能充分利用他的学习时间。

　　　　 　doing part-time jobs now and then, he has 　　　　　great 　　　　　in his studies, for he　 can make　　　　 of his time for study.

7．Confucius had a great influence on the development of China's culture and education.

　 Confucius____ ____ the development of China's culture and education.

6．The serious car accident resulted from the driver's carelessness.

　 　The driver's carelessness______the serious car accident.

5．The expert not only made some comments on the project but he also gave some suggestions

　 for further improvement.

　 Not only ____ the expert ___ some comments on the project but he gave some

　 .suggestions for further improvement ____ ____.