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，“出现”，如“ Did the lost ring ever turn up? .Turn off，”关闭“、”拐弯“，如” to turn off the highway and take the local road “。turn on：”打开“。 turn out，”原来“，表示以前不知道后来发现是，常用 turn out to和题中的句型，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，名词，“价值”。也可作介词，常用be worth doing/be worth+ obj..worthy ，形容词，“有价值的”，常用worthy of +obj.，如“ an effort worthy of praise”。 Worthwhile，形容词，“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有两种过去时和过去分词形式，当表示“绞死”的意思时，过去时和过去分词为 hanged、 hanged，当表示其它意项时会别是hung、hung.hang up的意思是“挂断电话”，所以这里选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，动词，意为“犹豫”，不及物，通常用hesitate to do.如“ If you need any help, don't hesitate to ask me .”其名词形式是hesitation ，另有hesitatingly，副词。
18.Too many people are indifferent _____ others' troubles.
A. with B. to C. of D. about
答案：B
解析：indifferent，形容词，“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，形容词，“高级的”、“高层的”、“优越的”，也看作名词，指“上级”。名词形式是superiority.其反义词是 inferior，名词是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“逐渐”的意思，其中后者更强调“一步一步地”。 sooner or later的意思是“迟早”。 off and on也可写成 on and off ，意思是“不时地、断断续续地”，如“The light was flashing on and off.”。
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