按要求完成下列各题。
1. bike/ are/ there/ boys/ twelve/ on/ the (.) (连词成句)
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2. horse/ the/ is/ riding/ boy/ a (.)(连词成句)
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3. There are three books on the table.(改为否定句)
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4. There is two pencils in the pencil-box. (改错)
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5. There are ten cats in the picture. (变一般疑问句)
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