13.Her speech touched _____ the issue of employee benefits.

　　A. / B. with C. on D. up

　　答案：C

　　解析：touch on，“涉及”、“提到”。

　　14.It_____ that the mysterious visitor was an old friend of my grandmother.

　　A. turned up B. turned off C. turned on D. turned out

　　答案：D

　　解析：turn up，“出現(xiàn)”，如“ Did the lost ring ever turn up? .Turn off，”關閉“、”拐彎“，如” to turn off the highway and take the local road “。turn on：”打開“。 turn out，”原來“，表示以前不知道后來發(fā)現(xiàn)是，常用 turn out to和題中的句型，如” He turned out to be a friend.“。

　　15.Please give me five pounds'______ of this chocolate.

　　A. worth B. worthy C. worthwhile D. value

　　答案：A

　　解析：worth，名詞，“價值”。也可作介詞，常用be worth doing/be worth+ obj..worthy ，形容詞，“有價值的”，常用worthy of +obj.，如“ an effort worthy of praise”。 Worthwhile，形容詞，“值得的”。

　　16.I ______ the telephone and wrote down the message.

　　A. hanged up B. hung up C. hanged D. hung

　　答案：B

　　解析：hang有兩種過去時和過去分詞形式，當表示“絞死”的意思時，過去時和過去分詞為 hanged、 hanged，當表示其它意項時會別是hung、hung.hang up的意思是“掛斷電話”，所以這里選B.

　　17.The government will not _____ the severest measures against the terrorists.

　　A. hesitate taking B. hesitate to take C. hesitate in taking D. hesitate take

　　答案：B

　　解析：hesitate，動詞，意為“猶豫”，不及物，通常用hesitate to do.如“ If you need any help, don't hesitate to ask me .”其名詞形式是hesitation ，另有hesitatingly，副詞。

　　18.Too many people are indifferent _____ others' troubles.

　　A. with B. to C. of D. about

　　答案：B

　　解析：indifferent，形容詞，“漠然的、冷淡的”，常用indifferent to.

　　19.This brand(品牌)of dog food is a bit expensive, but it is really_____ the others.

　　A. superior to B. inferior to C. superior with D. inferior with

　　答案：A

　　解析：superior，形容詞，“高級的”、“高層的”、“優(yōu)越的”，也看作名詞，指“上級”。名詞形式是superiority.其反義詞是 inferior，名詞是inferiority.

　　20.If you cheat, you will be found out _______.

　　A. by and by B. step by step C. sooner or later D. off and on

　　答案：C

　　解析：by and by和 step and step都表示“逐漸”的意思，其中后者更強調“一步一步地”。 sooner or later的意思是“遲早”。 off and on也可寫成 on and off ，意思是“不時地、斷斷續(xù)續(xù)地”，如“The light was flashing on and off.”。