【解析】考查定语从句。定语从句中stay为不及物动词，故不缺主干成分，用关系副词；先行词为house，指地点，故用关系副词where。

25.I got to the office earlier that day, the 7:30 train from Paddington

A. caught B. to have caught C. to catch D. having caught

【答案】D

【解析】考查非谓语动词。根据句意，因为我赶上了7:30的车，所以那天我更早地到了办公室，可知赶车发生在到办公室之前，且与主语I之间为主动关系，故使用现在分词完成体表主动完成。

26. Since nobody gave him any help, he have done the research on his own.

A. can B. must C. would D. need

【答案】B

【解析】考查情态动词。根据句意，由于没人帮他，因此他定是一个人做的那个调查。情态动词must表肯定推测。故选B。

27. We very early so we packed the night before.

A. leave B. had left C. were leaving D.have left

【答案】C

【解析】考查动词时态。根据so后的并列句“我们前一天晚上就打好包了”，可知，“我们会很早离开”，故使用过去进行时表过去将来的动作。选C。

28. The watch was very good, and he 20 percent down for it.

A. paid B. cost C. bought D. spent

【答案】A

【解析】考查动词辨析。短语pay some money for sth。故答案选A。

29. It may not be a great suggestion. But before ______ is put forward, we’ll make do with it.

A. a good one B. a better one C. the best one D. a best one

【答案】B

【解析】考查形容词比较等级。句意：这也许不是一个很好的建议，但在提出一个更好的建议之前，我们会设法应付的。根据句意用比较级。

30. It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.

A. when B. that C. which D. what

【答案】B

【解析】考查强调句。题干可还原为：Mr. Gross realized the task before him was extremely difficult to complete only after he had read the papers，即可判断为强调句，因此填that。

31 A serious study of physics is impossible some knowledge of mathematics.

A. against B. before C. beyond D. without

【答案】D

【解析】考查介词。根据句意，如果没有一点数学知识，要认真研究物理是不可能的。故选D（如果没有）.

32. Only by increasing the number of doctors by 50 percent properly in this hospital.

A. can be the patients B. can the patients be treated

C. the patients can be treated D. treated can be the patients

【答案】B

【解析】考查倒装句。Only+状语（从句）提前放于句首，句子应用不完全倒装，即将助动词can放于主语the patients之前，故答案选B。

33.Four and half hours of discussion took us up to midnight, and break for cheese, chocolate and tea with sugar.

A. a; a B. the; the C.不填；the D. a;不填

【答案】A

【解析】考查冠词。第一空表示“四个半”应用four and a half；短语a break表示“休息一会儿”，故答案选A。

34. It's an either-or situation - we can buy a new car this year or we can go on holiday but we can’t do .

A. others B. either C. another D. both