用所给单词的适当形式填空，英语1、A large number of _____________ have been k

用所给单词的适当形式填空，英语
1、A large number of _____________ have been killed in that area. (mouse)
2、He asked if I was a _____________ (work) ?
3、 She showed me some of her daughter's ______________(draw).
4、Has your mother ever been to ________________ ? (English)
5、Those books are very ____________ to the students. (help)