用所给单词适当形式填空
问题描述：
用所给单词适当形式填空
1.It【 】（sudden）rained when I was walking in the street yesterday
2.He cut his fingers yesterday,but they are not【 】（seriouly）
3.Children often【 】（injury）themselves
4.She【 】（not have to ）look after me
答
1.it suddenly rained
2.serious
3.injure.
4.she doesn't have to