翻译
1．那天在车站,我碰巧遇到了我的一位老朋友。
I____an old friend of mine at the station that day.
2．他再也没有见到救他的那个小伙子，也不知道他叫什么名字。
He_saw the young man who saved him again,what his name was.
3．昨天晚上离家时，他忘记锁门了。
He_the door when he left his home yesterday evening;．
4．这块手表太贵，我买不起。
The watch is too expensive,I____buy it.
5．我打算用这旧电脑，不买新的。
I'm going to use the old computer,_buying a new one.
6．他总是避免在热闹的街道上骑车。
Hebike on busy streets.
7．他那时是在写信，而不是在看报。
He was writing a letterreading the newspaper at that time.