29. With the bridge __________,  there was nothing for it but to swim
A. was destroyed            B. destroying
B. being destroyed          D. destroyed
[解析]本题语法题，本题句型是With引导的伴随独立结构，根据题意“桥”和“损坏”之间属被动关系。故选答案[D]。
题意“桥被破坏了，没有别的方式只能游泳过去”

30. Having no money but __________ to know, he simply said he would go without dinner.
A. not to want anyone       B. wanted no one
C. not wanting anyone       D. to want no one
[解析]本题是语法题，本题句型是but引导的前后并列句，并列句要求第一句Having no money和but引导的时态必须是保持一致的，所以选择答案 [C]。

题意“他没有钱还不想让任何人知道，只是轻松地说要出外面吃饭”

31. The children lined up and walked out __________
A. in place                 B. in condition
C. in order                 D. in private
[解析]本题是词汇题，答案A. in place平常的或应在地方；B. in condition表示某种状况下；C. in order按照一定顺序；D. in private表示私下或无人在场，根据题意“孩子们排成队按照顺序走出去”选择答案[C]。

32. The teacher, as well as all his students, __________ by the dancer""s performance.
A. was impressed           B. had impressed
C. impressed               D. were impressed
[解析]本题是语法题，考查主谓语一致性，以介词或介词短语连接的主语其谓语动词单复数取决于其前的主语。在本句中取决与as well as前的主语The teache是单数，只有答案[A]符合。
题意“这位舞蹈演员的表演给学生和老师留下了深刻的影响”

33. __________ is well known, the key to success lies in hard work.
A. As                    B. That
C. Which                 D. What
[解析]本题是语法题，考查状语从句，答案B. 引导的是宾语从句；C. 引导的是定语从句；D. 引导的是宾语或主语从句；只有[A]可以引导状语从句。
题意“总所周知，通向成功的路就在于工作的努力”

34. The doctor will not perform the operation __________ it is absolutely necessary.
A. so                     B. if
C. for                     D. unless
[解析]本题是词汇题，题意是表示“除非完全必要医生才会给实施手术”A. 表示“因此”；B. 表示“如果”；
C.“为…”；D.表示除非，所以选[D]。

35. Today the police can watch cars __________ on roads by radar.
A. run                     B. to run