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.