Teenagers _______ allowed to drive in the street ．

—Whose notebook is this?—It         Jane’s. It has her name on it.

Susan’s parents have bought a large house with a swimming pool.It      be very expensive.

—I think her dress comes from the 1970s.—It_________ be from that time. It looks so modern on her.

－You _______ be happy with the strong public support you’ve received.－Yes,you’re right.I’m really excited.

Four hundred dollars for just a pair of shoes? You ______ be joking!

—Must I go with you?—No, you ________.

 — Are you going to Beijing by air?— It’s fast, but expensive. So I’m not sure. I _____ take a train. 

 Everyone ______ be polite to the old people.

Kids _________ use the computers to draw in the future.

— May I take the magazine out of the reading room?— No, you can’t. You ______ read it here. It’s the rule.

-----Can I watch TV, Mom? -----No, you         . You          to do your homework first.

—Must I come back before supper, mum?—No, you        .

—Listen ! Helen is singing in the next room.—It __________ be Helen. She is in Tianjin now.   

—Look at the picture on the wall. It ________be David’s.—Yes, his name is on the first page.

Today, we _____ work as hard as people did in the past.

—We will go to the Wushan Square this afternoon, why not take a bus? —We ________ take a bus , it’s only one kilometer or more.

--Have you decided where to go for your summer vacation? --Not yet. We_________ go to Mount Lu. It is a good place for vacation.

-- _____ I ask you a question, Mr. Wang?      -- Yes, you _______.

With the help of the new technology, you __ e-mail your friends by mobile phone.