521.Let's learn to use the problem we are facing _______ a stepping stone to future success.
A.by nature
B.in return
C.in case
D.by chance
522.Modern equipment and no smoking are two of the things I like _____ working here.
A.with
B.over
C.at
D.about
521.答案是C;
use…as a stepping stone to future success.把…当作通往成功的阶梯。
522.答案是D;
句意:关于在这里工作，我喜欢的两件事情是现代化设备和禁止吸烟。
523.If you really have to leave during the meeting,you'd better leave ______ the back door.
A.for
B.by
C.across
D.out
524.Many Chinese universities provide scholarships for students ______ financial aid.
A.in favour of
B.in honour of
C.in face of
D.in need of
523.答案是B;
leave by/through the back door 从后面离开；across 横穿。
524.答案是D;
句意:许多中国大学向那些需要经济帮助的学生提供奖学金。In favour of 支持；in honour of 为了纪念；in face of 面对；in need of 需要。
525.Fred entered without knockign and,very out of breath,sank ___ a chair.
A.on
B.off
C.into
D.to
526.Animals suffered at the hands of man _____ they were destroyed by people to make way for agricultural land to provide food for more people.
A.in which
B.for which
C.so that
D.in that
525.答案是C;
sink into chair 颓然坐在椅子上。
526.答案是D;
in that 引导原因状语从句。
527.When she first arrived in China,she wondered what the future might have _____ for her,but now all her worries are gone.
A.in need
B.in time
C.in preparation
D.in store
528.When did you last hear _______ Jay?
He phoned me this morning,and we agreed _____ a time and place to meet.
A.of;to
B.about;which
C.from;with
D.from;on
527.答案是D;
in need需要；in time及时；in preparation 准备；in store 贮藏；储备。
528.答案是D;
hear about/of 听说；hear from收到来信；agree on sth.在…方面取得一致意见；agree to do sth.同意做某事；agree to sth.同意（计划，安排等）；agree with sb.同意某人的意见。
529.Elizabeth has already achieved success _______ her wildest dreams.
A.at
B.beyond
C.within
D.upon
530.Everything was perfect for the picnic _____ the weather.
A.in place of
B.as well as
C.except for
D.in case of
529.答案是B;
beyond one's wildest dreams 固定搭配:大大超出某人的预料。
530.答案是C;
except for 肯定整体，除去瑕疵，后跟名词；in case of 万一。句意:除了天气之外，一切都适合野餐。