Trắc nghiệm phân biệt "Since" và "For"

Câu 1. My grandparents walk _____ twenty minutes a day.

for

since

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

for

since

Câu 3. We have been dating _____ a long time.

for

since

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

for

since

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

for

since

Câu 6. My family has lived here _____ last March.

for

since

Câu 7. She has worked there _____ she finished college.

for

since

Câu 8. I have been calling you _____ half-an-hour.

for

since

Câu 9. Lisa and Jill have been at the library _____ a long time.

for

since

Câu 10. My teacher has been sick _____ last Monday.

for

since