互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒Fill in the blanks using must/might/may/can/could and their negative forms.
1.—I saw Mary in the street yesterday.
—You ______ have seen her.She is still in Australia.
2.—Could I use your bike?
—Yes,of course you ______.
3.The ground is wet.It ______ have rained last night.
4.A machine ______ think for itself.It ______ be told what to do.
5.Tom,don’t play with the valuable bottle.You ______ break it.
Suggested answers:
1.can’t 2.can 3.must 4.can’t,must 5.may/might
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