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参考答案:
1.It's not very useful to read the whole book.
2.It costed me 500 dollars to buy the ring.
3.It was a pity to miss the train.
4.Will it suit you to call me tonight?
5.Precautions of this sort are necessary,for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
