1 . It is highly important to prevent the environment from_________.

A．polluting

B．polluted

C．to be polluted

D．being polluted

2 . In order to avoid ________ (catch) by the coming policemen, the thief quickly jumped out of the window. (所给词的适当形式填空)

4 . People who risked their lives to save others are worthy of _________ (remember). (所给词的适当形式填空)

5 . The French writer and pilot nearly died and wandered around for days before________________ (rescue). (所给词的适当形式填空)

6 . His ________ (admit) to that famous university surprised us all for he was absent from school for a whole year. (所给词的适当形式填空)

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

8 . The soldier narrowly escaped ___________________(kill) in the fierce battle. How lucky he was! (所给词的适当形式填空)

9 . 该是我们采取措施阻止空气污染的时候了。(keep...from)
It is high time that we took measures to _____________.