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1. They are close friends and the friendship________college days is worth valuing.(date)

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2. She reached the airport,________the plane had already taken off.(only)
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3. He must be tired.Please ask him to have a rest.He________all the morning.(sharpen)
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4. Not knowing how to grow crops,the primitive people had no alternative________fruits or hunt animals for food.(gather)
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5. I________the way he talks about things in which it seems that he is always superior to others.(feed)
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6. If only________my hometown last month (return).
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7. After many years' hard work,she now_______

_almost all most kinds of music.(skilful)
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8. I'm sorry________,but you are wanted on the phone.(interrupt)
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9. The birds can sing beautifully,which________people passing by.(arrest)
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10. We haven't found any doors but we think they________animals skins at the cave mouth .(hang)
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