21. ----- Could you be so kind as to close the window?
----- _______.
A. With pleasure. B. Go ahead C. Yes, please. D. That’s OK.
22. We must accept the possibility ________ one, although working hard, may fail to reach his goal.
A. whether B. what C. that D. how
23. He was in hospital for six months. He felt as if he was ______ from the outside world.
A. cut out B. cut off C. cut up D. cut through
