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• it's fun to造句

• it is fun doing sth造句

• it is difficult to do造句

• it is for sb to do sth造句

• it isadj.+for/of sb. to do造句

• it is+n.+to do sth.造句

• it is one's duty to do造句

• it's for to do造句

• it is vital for sb to do造句

• it is for somebody to do something造句

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