1.You had better to go immediately, or you will be late for school.

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　　2.Today he is not in good health. so most of us think he is unlikely win the race.

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　　3.He happened to meet by Mary in the street when he was going home yesterday.

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　　4.In the early days, people didn't able to count as we do now.

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　　5.I seem to catch a cold because I have got a headache.

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