For or Since Quiz

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