21. You can be ______success, but you don't need to be ____ Bill Gates to be successful.
A. a; a B. the; / C. the; the D. /; the
22. We ________ you were in trouble at that time, otherwise we would have given you a hand.
A. didn't know B. haven't known C. don't know D. hadn't known
23.“How could you lose so much money?”Charlie asked his wife, eyeing her angrily from ________ the kitchen table.
A. at B. across C. through D. on
24. Nowadays people have to pass various tests for professional ______ so that they can be qualified for a well-paid job.
A. admission B. permission C. certificates D. perseverance