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Drinking too much alcohol is said to _____ harm to our health.

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Let’s to get up early to go for a walk before breakfast.

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The sign warns people _____ the dangers of swimming in this river.

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I suggest our rooms _____ before Tet Holiday.

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Event organisers should plan everything carefully so as to leave nothing to _____.

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Richard Byrd was _____ first person in history to fly over ____ North Pole.

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We were made_____ hard when we were at school.