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—I’m thinking of the test tomorrow.I’m afraid I can’t pass this time.

—________！I’m sure you’ll make it.

—I’m afraid I can’t finish the magazine within the required time.

—　　　.

A.Please go ahead　　　　　　　　　　　B.That’s right

C.Not at all　　　　　　　　　　　　　　D.Take your time

-Mary, would you like to come to my birthday party??

　-_____.

  A. Of course, you could 　 B. Sure. Go ahead

　 C. Sorry, you may not 　 D. No, you mustn’t

—Could I use your computer for a few moments，please?

—________.I’m not using it myself.

---I’m afraid I can’t finish the book within this week.

　 ---_____.

　　A. Please go ahead　　　　B. That’s right  

　　C. Not at all　　　　　　D. Take your time