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_________ air is one of the many problems we have to solve.

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He ________ to find a job but he had no luck.

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Minh’s English is excellent. He speaks________.

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If he ________ hard today, can he have a holiday tomorrow?

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________we were tired, we sat down beside the stream.

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We couldn’t go on a picnic as planned __________ it was raining.

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We can eat at home or, ________ you prefer, we can go to a restaurant.

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The boy likes ________ games but hates ___________ his lessons.