根据所给的汉语，用英语完成句子。与一些网友用电邮保持联系可能很危险。
It may be dangerous __________________________ some online friends by E-mail.他之前从未梦想过成为一名著名的作家。
He a famous writer before.我忍不住续借那本书，因为它是如此精彩。
I ___ the book, because it was so wonderful.听音乐能在一天的劳苦工作之后帮助我们放松自己。
Listening to music can help us .两丢失的小孩最后设法寻求到了帮助。
The two lost children ___ at last.短暂休息之后，那人继续游过那条河。
After a short break, the man ___ the river.