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3. Complete the sentences by using SINCE/ FOR.
1. I have been a teacher ......... I was 20.
2. Bob has worked in that import-export company ......... ten years.
3. She hasn't had a day off ......... five days.
4. I have studied English ......... summer.
5. Jenny has eaten five hamburgers ......... 9 o'clock.
6. They have all improved in attitude ......... their mother talked to them.
7. My parents have been married ......... five months.
8. I have known my best friend ......... Sunday.
9. The factory has run ......... June.
10. They have traveled in the USA ......... they had money.