题目内容
It is true that theseherbs (草药) can be used to _________pain.
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They are making further efforts to _________the cost of production.
My brother told me that he had met with no difficulty _________in learning English grammar.
Sam took this new job because he felt that the _________prospects (前景) were much better.
_________my girlfriend can't come to my birthday party because she has to go to Shenzhen on business.
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