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。

He                               bike on busy streets.

7．他那时是在写信，而不是在看报。

He was writing a letter                         reading the newspaper at that time.

汉武帝派遣谁出使西域？