1 . A man dressed in a black coat was observed ________ (enter) the house and later the owner found all the valuable things stolen. （所给词的适当形式填空）

2 . It is said that carbon dioxide is heating the earth twice as quickly as previously feared. (同义句转换)
Carbon dioxide is said __________ __________ __________ the earth twice as quickly as previously feared.

3 . During the cold winter months, some small animals would starve if food was difficult to ________.

A．find

B．be found

C．finding

D．being found

4 . Some think that students should be trained to d____________ themselves against some attacks.(根据首字母单词拼写)

5 . While going shopping, we usually can’t avoid being persuaded ______ (buy) things we actually don’t need. (所给词的适当形式填空)

6 . The policemen were ordered to s________ any prisoner trying to escape with their guns. (根据首字母单词拼写)

7 . He was appointed _________ (look) into matter. (所给词的适当形式填空)

8 . Jack is often seen __________ (chat) online with his former foreign teacher.

9 . As a punishment she was not permitted ________ (take) part in any school activity in a week.