— _______ does Tom like math? —Because ____

— _______ does Tom like math? —Because _____ fun.

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All of us find ________ necessary to take exercise every day.

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this

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them.

— How pleasant 　　　 is to go fishing with my father! — Yes. Parents and children should spend more time together.

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.Mum,  ________my teacher, Mr Wang.

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Wearing red can make ______ easier for us to take action.

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that

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____seems very hard to reach the top of the mountains.

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That

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