想一想，选一选。

1.当你想赞扬别人的想法时，你应说：        [ ]

A. Good idea.    

B. Good night.

2. 当你把卧室打扫干净后，你的妈妈会说：        [ ]

A. Good job!    

B. Good idea!

3. 当你想告诉别人，你应说：        [ ]

A. The wall is white.

B. The board is white.

—Must I finish my homework right now? 

-- No, you ___, you ___finish it tomorrow morning.

A．mustn’t, can

B．needn’t, must

C．don’t have to, may

D．can’t, have to