1 . ______(examine) once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country. (所给词的适当形式填空)

2 . We must do what we can to prevent the rivers from __________(pollute) by factories. (所给词的适当形式填空)

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

4 . The foreign friends you referred to are looking forward to ________ (show) around your university. （所给词的适当形式填空）

5 . He escaped _____ (kill) in the explosion because he had not gone to work. (所给词的适当形式填空)