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.
