1 . When the gorillas and I frightened each other, I was just glad to find________(they) alive. (所给词的适当形式填空)

2 . ________ is difficult to imagine the modern world without oil.（用适当的词填空）

3 . ________ is my belief that music is something that everybody likes and enjoys.(用适当的词填空)

4 . How silly it was of you________(give) up such a good chance! (所给词的适当形式填空)

5 . ________is generally believed that stress is caused by too much work and little rest. （用适当的词填空）

6 . ________is an honor to be here to share with you my opinions on what to learn in senior high school.（用适当的词填空）

7 . ___________ is well-known that Chinese people are not only hard-working but friendly. (用适当的词填空)

8 . The heavy rain makes ________ impossible for me to go there. (用适当的词填空)

9 . It’s a waste of time ________ (persuade) such a person to join us.(所给词的适当形式填空)

10 . The classes in the UK are different from ________ in China. （用适当的词填空）