【题目】将下列句子补充完整。
1. He is _________________ his homework. (他正在做功课呢)
2. He ____________________ his homework.（他不是在做功课）
3. She is ___________________. (他正在睡觉)
4. Sam ________________ tidy his room. （Sam不在整理他的房间）
5. ____________________________________________？（他在干嘛）
【答案】1.doing
2.isn’t doing
3.sleeping
4.isn’t doing
5.What’s he doing
【解析】略
