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-----Is it good to look up every new word when I come across it in reading?

-----No. You _______ because you are likely to guess the meaning from the context.

A. can’t              B. mustn’t             C. don’t have to   D. shouldn’t

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7. It is not enough only_____the rules of grammar if you want to learn English well.

A. keeping in the mind

B. to keep in mind

C. to keep in your mind

D. keeping in your mind

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6. The temperature can fall to －50°C. _____ is, 50°Cbelow freezing point.

A. Which    B. It      C. This     D. That

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_________we sleep together or apart is one of the biggest cultural differences, and only in western societies ______ the feeling that babies should sleep apart from their parents.

 A. No matter; it is        B. Whether; is it     

C. No matter; there is      D. Whether; is there

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—___________ makes her different from the other students?

—Diligence, I think.

A. How is it that          B. How is that     

C. What is it that             D. What is that

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