（）负责将纱线由中部导向边端，（）负责将纱线由边端导回中部。

句型转换。

1.This is a pencil case. (变为一般疑问句)

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2.Is that her key? (否定回答)

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3. not, is, my, it, backpack (连词成句)

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4.This is a pen in English. (对画线部分提问)

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5.It is a ring. (对画线部分提问)

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