Условие задания:

6 Б.
Read the sentences and choose since or for 
1. Mary has been waiting for a reply ..... weeks.
2. Mr Smith has been in that meeting ..... hours! 
3. I have worked for International House ..... more than eight years.
4. Peter has been my best friend ..... we were nine.
5. I've worked here ..... April.
6. We've been waiting for you ..... twenty minutes.