He was afraid ________ he could catch up with others.

A. that

B. who

C. if

D. what

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桪o you like David？

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桬xcuse me. Is there my e-mail?

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桪id you watch the football game on TV?

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The book is very old. We can see it was written in ________ century.

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________ is the population of Germany?

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桰 hope everything goes well with your work.

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Doing morning exercise ________ us a lot of good, as is known to us all.

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