The traditional view is ______ we sleepbecause our brain is “programmed” to make us do so.

It’s easy to make friends, but it’s difficult to keep the ________ longer.

____ made the school proud was _____ more than 90% of the students had been admitted to key university .

You look tired.—Yes. I want __________ to bed.

______ all his fortune gone, the playboy could do little to preserve the family fame.