For or Since · exercise 2

My grandparents walk ___ twenty minutes every day.

How long is it ___ you wrote to your pen pal?

We have been dating ___ a long time.

That lady has been waiting for the bus ___ noon.

I studied for this test ___ three days continuously.

My family has lived here ___ last March.

She has worked there ___ she finished university.

I have been calling you ___ more than an hour.

Lisa and Jill have been at the library ___ ages.

My teacher has been ill ___ early on Monday.