1 . It was the third time that I _________ (bite), so I went to the hospital a third time. （所给词的适当形式填空）

2 . It is no good ____________(learn) without practice.（所给词的适当形式填空）

3 . It was not until we suffered a lot from the loss of a balanced environment _______ we realized the importance of protecting wildlife. (用适当的词填空)

4 . I’d appreciate ___________ if you keep silent. (用适当的词填空)

5 . It is no good ____________ (cry) over split milk. (所给词的适当形式填空)

6 . Last Monday, I was chatting online ______, before I knew it, our manager came in and stood behind me.

A．until

B．as

C．when

D．while

7 . It is strongly ________ (建议) that the machines should be checked every year. （根据汉语提示单词拼写）

9 . It’s no use ________(cry) over spilt milk. （所给词的适当形式填空）

10 . It was the second time that he________(rush) out of the classroom without permission. (所给词的适当形式填空)