问题
连词成句
连词成句，注意单词的大小写及标点符号。
1. your, what, head, to, happened (?)
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2. a, we, watermelon, bought, so (.)
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3. watermelon, Sam, the, carried, bikc ,the, on (.)
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4. his, then, fell, Sam, bike, off (. )
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答案
1. What happened to your head?
2. So we bought a watermelon.
3. Sam carried the watermelon on the bike.
4. Then Sam fell off his bike.