32. The Without heat and sunlight, plants on the earth __________ well.  
A. would not grow          B. will not grow  
C. had not grown           D. would not be grown
答案：A虚拟语气，Without引导含蓄的虚拟条件句，本句是与现在的事实相反的句子。 

33. Only recently __________ to deal with the environmental problems.  
A. something has done       B. has something done  
C. has something been done  D. something has been done
答案：C倒装结构，Only 放在句首，句子倒装。 

34. The question __________ at the meeting tomorrow is very important.  
A. to discuss               B. being discussed  
C. to be discussed           D. will be discussed
答案：C不定式的用法，不定式短语用作动语修饰名词，主语和动词之间为被动关系，因此用被动形式。 

35. Since this road is wet and slippery this morning, it __________ last night.  
A. must rain               B. was raining  
C. must have rained         D. may rain
答案：C情态动词，主语+ must + have +过去分词，表示对过去事实的推测。

36. The mother didn't know __________ to blame for the broken glass as it happened while she was out.  
A. who                    B. when  
C. how                    D. what 
答案：A动词不定式的疑问式的用法，连接代词或副词+不定式够成了不定式疑问式，在句子中可以做主语、宾语、表语和状语。

37. I believe that every crime, __________ the circumstance, should be severely punished.  
A. in spite of               B. because of  
C. instead of               D. on account of
答案：A短语辨析，in spite of 不管，不管；because of因为，由于；instead of 代替；on account of由于，因为。根据句意A符合。

38. The workers are busy __________ models for the exhibition.  
A. to make                B. with making  
C. being making            D. making
答案：D固定搭配be busy doing sth 忙于做…。

39. Yesterday Mr. Smith gave a vivid __________ of his recent visit to China.  
A. dialogue               B. idea  
C. tale                    D. account