（1）This kind of plant may not be planted ________．It may be planted in water．

（2）Hi，what are you doing there ________，boy？

（3）I'm sure no one knows how many people are living ________．There are too many to be counted．

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The roots must be protected ________the wind，rain and insects．

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It is said that one third of the waste ________food．

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Most poisons are ________one's body．Be careful of them！

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Planting and keeping trees ________to the environment．

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How much did the sideline（副业） ________the farmer family ________last year？

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If you can practise speaking English ________，you will make a great progress．

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Though it is dark，________ they are working．

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I didn't allow him to do that because he went ________my wishes．

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We are making ________energy from the sun in many ways，such as heating and cooking．

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