1.They are having lunch now.(对having lunch提问）
2.三班的学生正在做作业.（根据中文提示完成句子）
The students of Class Three( )their homework.
3.What are you doing now?(go to school)(用所给词组回答）
4.Lucy is talking to Lily.(对Lucy提问）
5.We are standing on the Great wall.(改为否定句）
6.Betty and Lingling are writing postcards.(对writing postcards提问）
7.Tony is eating an ice cream.(改为一般疑问句并做肯定回答）