将下列各题的简单句合并为含有定语从句的复合句
1.The boy likes playing soccer.The boy is seven years old.
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2.He went into a store.There were a lot of toys.
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3.Jack can answer these questions.These questions are difficult to others.
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4.I still remember the classroom.I met her for the first time there.
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5.This is the book .I want to read the book.
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