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31. The child enjoyed _____ up the wooden bricks then knocking them down.
A. adding B. pushing C. piling D. forming
C. piling.
pile up (=lay in a pile or as if in a pile) 把......放成一堆, 堆积：pile up the books on the table (把书堆在桌子上) 。Pile up作不及物动词用, 意为“积压; (若干汽车) 相撞”：1) Perishable goods are piling up at the docks. (码头上易腐烂的货物堆积如山。) 2) Several cars piled up after ignoring the fog warning on the motorway. (由于无视高速公路上的大雾警告, 有好几辆汽车相撞。)
32. John was very upset because he was _____ by the police with breaking the law.
A. accused B. arrested C. sentenced D. charged
D. charged.
be charged with受指控犯有......; He was charged with murder. (他受指控犯有凶杀罪。)
33. It isn't quite _____ that he will be present at the meeting.
A. sure B. right C. exact D. certain
D. certain.
I am sure that +从句。He is sure to come. = He is certain to come.但在it作形式主语, that引导主语从句时, 主句中表语只能用certain, 不能用sure.
34. The members of the club wouldn't run a _____ in entrusting(委托) the organization to an unreliable person.
A. danger B. risk C. loose D. chance
B. risk.
run a risk (in) 冒险：You are running a big risk in trusting him.
本题译文：俱乐部成员不愿冒险把这个组织委托给一个不可靠的人管理。
35. My brother likes eating very much but he isn't very _____ about the food he eats.
... 