用since 和for 填空。

1.The German teacher has worked in China _______quite a few years.

2.Dick has worked as a taxi driver_______ about ten years.

3.Helen has worked as a shop assistant_______ 1992.

4.We have studied English_______about five years.

5.They have studied French_______1990.

6.Hans has made a lot of friends_______he came to China.

7._______last January, the city has developed its telephone services swiftly.

8.I have been a Youth League Member (青年团员)_______two years.