问题详情：
用括号中所给单词的适当形式填空。
1. Mary (hit) him on the head with a book.
2. We enjoyed (we) at the dancing party last night.
3. Don’t play with (knife). They may cut your fingers.
4. She never (mean) anything of the sort.
5. We took the difficult (decide) to leave.
【回答】
1. hit 2. ourselves 3. knives 4. meant 5. decision
知识点：构词法
题型：完成句子
