5. It’s about ten years __________ she left the city.

4. She has been away from the city ___________ about ten years.

3. Our teacher has studied Japanese _________ three years.

2. I’ve known him __________ we were children.

We have known each other for twenty years. 我们认识有二十年了。

I haven’t seen her for a long time. 我好久没有见到她了。

练习：用since和for填空

1) ______ two years　　　　　　　　　 2) _______ two years ago　　　　　　　　 3) _______ last month 　　　

4) ______ 1999　　　　　　　　　　　　　 5) _______ yesterday　　　　　　　　 　　　 6) _______ 4 o’clock

7) ______ 4 hours　　　　　　　　　　　 8) _______ an hour ago　　　　　　　　　　 9) _______ we were children

10) _____ lunch time　　　　　　　　 11) ______ she left here

1. He has lived in Nanjing ________ the year before last.

Mr. Smith has worked here since 1984. 1984年以来，史密斯先生一直在这工作。

He’s learned about 5,000 English words since he went to college. 他上大学以来大约学了五千个英语单词。

45. Study hard, ______ you will fall behind the other.

　 A. and　　　 B. but　　 C. or　　 D. though　

44. I left my umbrella in my room. Could you wait ______ I go back to get it?

　 A. when　　　 B. if　　 C. while　 D. before

43. Lucy knew nothing about it ______ her sister told her.

　 A. because　　 B. until　 C. if　　 D. since

42. ______ my mother ______ my sister watches TV plays these days.

　 A. Either, not　 B. Both, and　 C. Neither, or　 　her, nor