普陀区高三英语第一学期期末质量抽查卷&语法题2,

普陀区高三英语第一学期期末质量抽查卷&语法题2,
36.Don't waste lots of time looking for the answer to one qusetion.Leave it and come back to it later____.
a if it neccessary b if is necessary d if necessary
38.The young man waited in the park and after___seemed half an hour the girl finally came.
a that b it which d what
39.Within industries,companies are always trying to develop produces that are one step better than ___ of other companies
a one b that c those d all
40.Many representatives were in favor of his proposa; that a special committee____ to investigate the invident.
a were set up b was set up c be set up d set up
答案是DDCC,求详解,
38题,A that B it C which D what