按要求改写下列英文句子：

1.It is not necessary to have a new building in our school. 同义句 It is _____ _______ to have a new building in our school. 2.Tom could work out this Maths problem himself. 同义句 Tom _____ ______ work out this Maths problem himself. 5.Let's go swimming.改为反义疑问句 Let's go swimming,____ _____.

1.not important 2.are able to 3.shall we?

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