1. My grandparents walk _____ twenty minutes a day.

 for
 since

2. How long is it _____ you visited your grandparents?

 for
 since

3. We have been dating _____ a long time.

 for
 since

4. That lady has been waiting for the bus _____ noon.

 for
 since

5. I studied for this test _____ three days straight.

 for
 since

6. My family has lived here _____ last March.

 for
 since

7. She has worked there _____ she finished college.

 for
 since


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