27. does________ matter if he can’t finish the job on time?
a. thisb. thatc. hed. it
答：d。
28. is________ necessary to complete the design before national day?
a. thisb. thatc. itd. he
答：c。
29. tom’s mother kept telling him that he should work harder, but______ didn’t help.
a. beb. whichc. shed. it
答：d。it指前边提到的事，若句中投有but，可选b项，为非限制性的定语从句。
30. it was in the room ________ he lived ________ we held the meeting.
a. that, thatb. where, that
c. that, whered. where, where
答：b。where he lived为定语从句修饰room，该句强调in the room状语部分。
31. —why don’t we take a little break?
—didn’t we just have ______?
a. itb. thatc. oned. this
答：c。co have (take) a break为习惯用法。
32. someone is ringing the door. go and see___.
a. who is heb. who is
c. who is itd. who it is
答：d。it指人，宾语从句应用陈述语序。
33. the parkers bought a new house but _____ will need a lot of work before they can move in.
a. theyb. itc. oned. which
答：b。it 指a a new house.