31。 We’re leaving at six o’clock, and hope ____B_____ most of the journey by lunch time。 
A。 to do B。 to have done C。 to make D。
   to have made 
不定式的完成十用来表示这个动作发生在谓语动作之前，或是表示该动作的完成。不定式的完成式表示的正是该动作的完成，可写为：We're leaving at six o'clock , and hope that we will have done most the journey by lunch time 。
  
32。 The study of the wild world may help to make the world easier ____A_____。 
A。 understood B。 to be understood C。 to understand D。
   understand 
make。。。understood:更好的被了解
36。 Allen had to call a taxi because the box was ____A_____ to carry all the way home。
   
A。 much too heavy B。 too much heavy 
C。 heavy too much D。 too heavy much 
“much too”的组合，后面只能搭配形容词或副词，而“too much”的组合，后面只能接名词。
  所以答案只能选A。
39。 Do let your mother know all the truth, she appears _D________ everything。 
A。 to tell B。 to be told C。 to be telling D。
   to have been told 
这个是个强调句型,DO + 动词原形,表示对该动作的强调。 
被告知所有的事情用被动语态。又因为是在说话之前,她似乎已经被告知了所以用完成形式,用不定式完成式的被动式。
41。 The problem is ____D_____ difficult for us __________。
   
A。 so; work out B。 very too; to be worked out 
C。 rather too, to work out D。 quite too, to work it out 
quite too:非常 work it out:解决。
  。。
43。 I’ve worked with children before, so I know what __B_________ in my new job。 
A。 expected B。 to expect C。 expects D。
   to be expecting 
what to expect==what I should expect。