1 . I appreciate ________ (give) the opportunity to join in the activity. (所给词的适当形式填空)

2 . I’d appreciate ________ (give) the chance to deliver a speech. (所给词的适当形式填空)

3 . The escalator in the shopping mall won’t be put to use before ________ (repair). (所给词的适当形式填空)

4 . I would like to send congratulations to you on your ______ (admit) to Peking University. (所给词的适当形式填空)

5 . 我们应该采取措施去防止河流被污染。（prevent...from...）（汉译英）

6 . Usually at the beginning of school, the noise of desks ______ and closed could be heard in the street.

A．opened

B．being opened

C．opening

D．to be opened

8 . 如何才能停止对河流的污染是一个大问题。
________ is a big problem.

10 . If I were her staff, I really wouldn’t tolerate _________ (scold) by her every day. (所给词的适当形式填空)