For or Since Quiz

1. My grandparents walk a) for b) since twenty minutes a day.
2. How long is it a) for b) since you wrote to your penpal?
3. We have been dating a) for b) since a long time.
4. That lady has been waiting for the bus a) for b) since noon.
5. I studied for this test a) for b) since three days straight.
6. My family has lived here a) for b) since last March.
7. She has worked there a) for b) since she finished college.
8. I have been calling you a) for b) since half-an-hour.
9. Lisa and Jill have been at the library a) for b) since a long time.
10. My teacher has been sick a) for b) since last Monday.