She was in hospital for about half a year. He felt as if he was ________ from the outside world. [ ]

eens don’t get enough sleep because they havetoo much homework to do, which _______ them up at night．

I’ve promised to help you and I’ll _____ my word

People laugh at jokes, but seldom ________ about how they work.

Whose hair band is this—It _____ be Grace’s. She is the only girl at the meeting.