You must ___________ on your study.你必须集中精力学习。
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He is our sales_________ in France.他是我们在法国的销售代表
The extra money came in very ________.额外的钱非常有用。
This overcoat has seen me _________ many severe winters.这件大衣帮我度过了许多个严寒的冬天。
match the words in the first column with the meaning in the second column.
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