He _____________ (look) for her keys for an hour.
has been looking
How many times _________ (you/take) this exam?
have you taken
Her legs hurt because she __________ (work out) for hours.
had been working out
I've been waiting for the waiter to bring my food, but the chef __________ (cook) it yet.
hasn't cooked
I feel sick. I _____________ (eat) chips for three hours straight.
have been eating
I _______ (wait) at the airport for hours for my plane to take off. I'm getting tired.
have been waiting