How many pears do you want? ________. 

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—Can I use your car this afternoon?

—________, but I'm going to do some shopping this afternoon.

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—Please let me use that computer, Mr Cook.

—________.That's Mr White's. He never lets others use it.

[　　]

—Could I keep the book until tomorrow?

—________ , but you mustn't lend it to others.

[　　]

(Henry wants to see his teacher, Mr Brown.)

—________ I see you this evening, Mr Brown?

— Certainly. Please come any time this evening. I'm free.

[　　]

(Mrs Jackson gets on a bus and asks another woman)

—________ I take this seat?

—Sure, please.

[　　]

—________ come in, Mrs Black?

—Certainly. We're all waiting for you, Tom.

[　　]

—Can I help you?

—________.

[　　]

—Can I have ________ coke?

—Sorry, you can't have ________ coke.

[　　]

—It's two yuan. That's________.

—Oh, that's ________. Give me seven.

[　　]