—Must I go there right now, mum?

—No, you ____. You can go there tomorrow.

A．shouldn’t        B．can’t            C．mustn’t          D．needn’t

David hated spending money. When he had to buy something in a shop, he always tried his best to knock down the price, even for the cheapest things. If he wanted to buy a bottle of orange, for example, and the shopkeeper asked for $2, David would say, “Make it $1.90 and I’ll buy it.” Sometimes the shopkeepers agreed to reduce their prices a little. “What’s ten cents?” they asked themselves. “If it makes this man happy, it won’t hurt me very much.” In this way David saved a few cents here and a few cents there, and by the end of the year he had saved several hundred dollars.

One day he had a very bad toothache and had to go to the dentist. The dentist looked at the tooth and said, “This tooth will have to come out. It’s too serious to save.” “How much must I pay you to take out a tooth?” David asked. “Forty dollars,” the dentist said. “How long will it take you to pull out the tooth?” he asked. “About two minutes,” the dentist answered. “Forty dollars for two minutes’ work!” he shouted, “That’s robbery (抢劫).” The dentist smiled. “You’re right,” she said. “Thank you for telling me. I’ll pull your tooth out very slowly. How about if I take half an hour?”

1.In the passage the underlined word “reduce” means “____________”

2.Why must David’s tooth be pulled out?

3.After the dentist answered David’s question, he became very _________.

4.David thought that two minutes was ____________.

5.What kind of person do you think David was?

—Must I get up before seven o’clock tomorrow?

—_______. It is Sunday tomorrow, you can have a good rest.

                  A. Yes, you must                       B. No, you don’t have                C. No, you needn’t

--- Must I do the rest of the work today?

--- No. You _________  finish it tomorrow.

A．must             B．can              C．needn’t         D．can’t

—Must I make a phone call to him now?  
—No, you________. You ______ write an email.