连词成句，注意标点符号和大小写。
1. having, Jane, a, is, party, birthday (.)
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2. down, are, the, falling, apples, stairs (.)
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3. this, bought, book, I, you (.)
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4. his, he, riding, is, bike (.)
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5. space, spent, he, about, hours, twenty-one, in (.)
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