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Problems ________ happen when family members do not discuss with each other how they really feel.

[  ]

A.can

B.must

C.should

D.ought to

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单词拼写
【小题1】Did you d______ my message to your father?  
【小题2】The discussion f_____ on three main problems.   
【小题3】Suddenly it h____ me how difficult it was for a woman to get medical training at that time.  
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【小题7】You should be modest as a________(专家) .
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【小题9】The bad weather has________(减少)grain harvests in the last couple of years.
【小题10】It is not w_______ to discuss the question again and again. 

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Today, bicycles are elegantly simple machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle was invented in Germany in 1818. Because it was made of wood, it wasn’t very strong nor did it have pedals (脚踏板).Riders moved it by pushing their feet against the ground.

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B.describe the problems early bicycle makers experienced

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