请将下面这段话翻译成英文：
1.把整本书都看完美多大用处。
2.我买这枚戒指花了500美元。
3.错过了火车真令人惋惜。
4.今晚上我给你打电话对你来说合适吗?
5.作出这样的准备是必要的，因为无法预见到洞穴探险者究竟会遇到什么性质的困难。
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.
