The box was so heavy that my son couldn’t carry it ->  It  

Câu hỏi liên quan

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  I love going to the mountains _______ the winter.

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  A lawnmower is a machine __________ is used for cutting grass.

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  Sheila works _________ an accountant in a large company.

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  It was ___________ good music that I couldn’t stop dancing.

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