1 . The pouring rain that night made it hard for witnesses ____________ (identify) the murderer. (所给词的适当形式填空)

2 . ________ worried me that my mother’s eyesight was declining. (用适当的词填空)

3 . However, the high speed train has made______ much more convenient for them to go back home. (用适当的词填空)

4 . It is an honour _________(select) to this band. (所给词的适当形式填空)

5 . I want to make ________ clear that I have no prejudice against you. (用适当的词填空)

6 . ________is likely that this kind of shark will die out in the future. （用适当的词填空）

7 . It is estimated ________up to 60% of the local population is being reached through these radio broadcasts. （用适当的词填空）

8 . ________is a pity that you missed the film. (用适当的词填空)

9 . ________ is a good idea to take part in social activities, which can promote our understanding of the world. （用适当的词填空）

10 . It is difficult to __________(breath)at these altitudes. (所给词的适当形式填空)