题目内容：

翻译句子

1.他总是惦记着她。(on one’s mind)

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2.交通堵塞产生了大量的污染。(a great deal of)

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3.即使失败10次，我也不灰心。(lose heart)

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4.她经常改变主意。(change one’s mind)

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5.他的实验一定能成功。(succeed in doing)

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