________ cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them.

I was very exciting I heard the news that the high-speed rail would be built from Guangzhou to Xiamen.

Can I help you—_______________________.

There ____ many places ofinterest in Beijing.

－Look, your sister is playing the pianoover there. －She ______ be my sister. She has gone to America.A. mustn’t B.can’t C.shouldn’t D. may not