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1、Yes ~ ~ (It has a great influence on .) Example: Smoking at present has a great influence on our health. One advantage of smoking has a great influence on our health is that the advantage of using solar energy is that it won"t produce any pollution. The advantage of using solar energy is that it won"t create any pollution.

2、: The reason why we have to plant trees is that they can provide us with fresh air. The reason why we must plant trees is that they can supply us with fresh air. The reason why we must plant trees is that they can supply us with fresh air.

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