__________the rule you will take no difficulty to grasp the meaning of it.

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The soil __________down into the rivers when it rains.

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Would you please __________the little plants __________soil?

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Of the three foreign guests, one is from London, ________ two are from New York;

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The old people ________ in the place.

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The villagers are not ________ young trees for fire wood.

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Sunlight and water can make plants ________ better.

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About 40% of the travellers to Shanghai ________ from foreign countries.

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Tom, come in and read at the table. Don't read ________ the sun.

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Nobody can stop him ________ the experiment.

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