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用方框內(nèi)所給單詞的適當(dāng)形式填空，每空限填一詞，每詞限用一次。

1．Nothing in the world is            if you decide to do it．

2．The children enjoyed               in the zoo last Saturday．

3．I didn't go                yesterday．I stayed at home the whole day．

4．We should care for the wild animals in                 ．

5．Yang Lei's mother agreed with her daughter's              ．

6．               ，he won first prize in the English speech competition．

7．Many famous people give their money to               and do a lot of work to help the poor．

8．I wasn't            to find my worst report was from my math teacher，because he said l was a lazy student．