1 . You can’t imagine what great difficulty we have ever had ______ (find) the person you referred to in your letter. (所给词的适当形式填空)

2 . This is a programme run by the organization to raise money to save the world’s last remaining gorillas from ______ ______ (灭绝). （根据汉语提示完成句子）

3 . Just to satisfy my ______ (curious), how much did you pay for your car? (所给词的适当形式填空)

4 . Since I have recovered, I now look forward to ________ (go) back to school as soon as possible. （所给词的适当形式填空）

5 . The flat terraces catch the rainwater and prevent the soil from________.(被冲走)(根据汉语提示完成句子)

7 . The policeman spent only several minutes ______(recognise) the murderer（凶手）. (所给词的适当形式填空)

8 . They are looking forward to ______ (settle) the argument between the neighbors. (所给词的适当形式填空)

9 . 如何处理塑料垃圾已经变成一个严峻的问题。
The problem of ______ ______ waste plastics has become a serious one.

10 . He was making a speech without __________(参考) to his notes.