1. (2017七下·吴江期末) 根据所给单词和句意，用适当的词填空，在答题卷上标有题号的横线上，写出空缺处各单词的正确形式。每空只写一词。

1. （1） We can clean our desks and chairs first and help to cleanlater．(they)

3. （2） My brother is fixing mycomputer．(break)

5. （3） The boy is veryand he often leaves his keys at home．(care)

7. （4） People in America use forks andwhen they have dinner．(knife)

9. （5） His grandfather fell off the bicycle and washurt．(bad)