1.If you_____ the bottle and cigarettes, you'll be much healthier.
A) take off B) keep off C) get off D) set off
答案：B keep off 避开。take off 起飞。get of下车。set off动身，出发。
2.The social ladder ____the poor children____ high education.
A) keep...off B) get...off C) take... off D) set...off
答案：A keep off 使远离于，符合题意。
3.It is difficult to _____a conversation with someone who only says "Yes" and "No".
A) keep up B) keep to C) keep on D) keep off
答案：A keep up 意为“坚持，持续”，符合题意。keep to 意为“遵守，信守，坚持”。keep on 意为“继续，反复地做(某事)”。keep off 意为“(使)不接近，(使) 让开”。
4.I have had a great deal of trouble _____the rest of the class.
A) coming up against B)making up for C) keeping up with D)living up to
答案：C keep up with跟上，不落在……的后面。come up against 遇到( 困难或反对) ;与……相抵触。make up for 弥补。live up to 按……行事，达到(标准等) 。
5.Since the mosquitoes were _____, the island has become a far more pleasant place to live in.
A) kicked out B)killed off C)knocked down D)killed down
答案：B kill off 消灭。kick out 踢出。knock down击倒。
6.A submarine car attain the speed of twenty ____ under water.
A) gallons B)pints C)liters D)knots
答案：D knot“海里，里”。gallon“加仑”pint“品脱”。liter“升”。
