8, "Underground"is the only word in the English langunge_______ begins and ends with the letters"und".
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9. He's not a perfect child. He sometimes talks back_______ his parents talk with him.
A. if
B. before
C. when
10. Victoria, hurry up!_______ we can't arrive there on time.
A. Or
B. So
C. And
11.—Have you ever been to Beijing?—Yes. I ________ there last winter.
A. have been
B. went
C. goes
D. go
12. —Must we clean the room now?—No, you________.
A. mustn’t
B. needn’t
C. can’t
D. don’t
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