—Mum, can I watch the TV program for another twenty minutes?—Sorry, dear, it's time you ________ to bed.
The traveler _______ his coat on a stone and _______ down to have a rest.
The ______ look on the manager’s face suggested that he _______ to overcome the difficulty.
I told her we weren’t going to be friends any more because she couldn’t ________ .
The world’s population has grown by ______ it was in 1800.
He failed in the driving test again. He_______.