劳；You’re welcome不客气。故选B。
4.Would you please make up a topic worth in tomorrow’s conference? A.discussing C.to discussed 答案 A
解析 worth...作后置定语，修饰a topic；worth后常用doing，主动形式表被动含义。
5.Running a company is not a matter of hiring people—they also need to be trained. A.simply C.seriously 答案 A
解析 句意为：经营公司不仅仅是一个雇佣人的问题——这些人也需要培训。simply简单地，仅仅；partly部分地；seriously严肃认真地；equally平等地。
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B.to be discussed D.being discussed
B.partly D.equally
6.The story shows that knowledge of first aid can make real difference. A.the；the；/ C./；the；a 答案 B
解析 考查冠词的用法及固定搭配。句意为：这个故事表明有了急救知识确实能起很大的作用。knowledge是不可数名词，一般前面不能加不定冠词，但a knowledge of sth.掌握某方面的知识，前面需加a；first aid前面不用加冠词；make a difference有影响，有关系，是固定短语，故选B项。
7.—I didn’t see you at the concert last week.What a pity!
—If only I the time. A.afford C.had afforded 答案 C
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B.a；/；a D.a；/；/
B.afforded D.would afford
解析 考查虚拟语气。句意为：——很遗憾！上周的音乐会上没有看到你。——如果我能抽得出时间就好了。从第一句话看出答话者没有去听音乐会，根据答语可知，此处是对过去情况的虚拟，因此选C。
8.The landlady had a few rooms to rent for the students. A.empty C.vacant 答案 C
解析 empty里面未放东西的；blank空白的；vacant未被占用的，空着的；hollow中空的。根据句意可知C项正确。
9. the job takes a significant amount of time，most students agree that the experience is worth it.(2015·湖南，33) A.If only C.Although
B.blank D.hollow
B.After D.In case
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答案 C
解析 句意为：虽然这份工作要花大量的时间，但大多数学生都同意这次经历是值得的。句中的a significant amount of time与worth it之间构成对比，故用although引导让步状语从句。 10.Health problems are closely connected with bad eating habits and a of exercise. A.limit C.need 答案 B
解析 句意为：健康问题与不良的饮食习惯和缺乏锻炼息息相关。lack 缺乏，符合句意。limit限制；need需要；demand需求。
11. As far as I’m concerned，walking is a cheap，safe and enjoyable form of exercise. ，it’s environmentally friendly.
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B.lack D.demand