连词成句，注意大小写及标点符号。
1. do, you, how, a, tree, plant (?)
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2. does, the, where, rain, from, come (?)
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3. am, going, I, flowers, in, to, plant, our, garden (.)
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4. see, sprout, can, you, days, in, several, the (?)
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5. can, vapour, how, the, water, become (?)
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6. hot, is, in, it, the, river (.)
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1. How do you plant a tree?
2. Where does the rain come from?
3. I am going to plant flowers in our garden.
4. Can you see the sprout in several days?
5. How can the water become vapour?
6. It is hot in the river.