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