按要求写句子。
1．Collecting stamps is his hobby. (改为否定句)
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2．My hobby is riding a bike. (改为一般疑问句)
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3．Have you got any photos of your bicycle?(做否定回答)
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4．I like riding a bike.(就划线部分提问)
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5．I've got some books.（改为一般疑问句)
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