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Passers-by just looked _________ as a man was attacked．

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I like to look _________ on my high-school days, which were the happiest in my life．

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The government has set up a working party to look _________ the problem of drug abuse．

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Do look _________ for spelling mistakes when you check your work．

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The doctor will look _________ again this evening．

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He said he would look _________ to see who might be able to help us．

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这场火灾该由谁负责？

Who is _________ starting the fire?

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那次事故不能怪孩子们。

The children were _________ the accident．

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警察把那起交通事故归咎于杰克的粗心驾驶。

The police _________ Jack’s careless driving．

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他的同伴没有谨慎驾驶，应对事故负责。

His companion _________ the accident, had not been driving carefully．