27. The new appointment of our president _A_ from the very beginning of next semester.
A takes effect B takes part C takes place D takes turns
semester n. 学期； president n. 大学校长； take effect 生效，发生效力；
take part in 参与，参加； take place=happen 发生； takes turn to do sth. 轮流做某事。
28. The president made a _A_ speech at the opening ceremony of the sports meeting, which encouraged the sportsmen greatly.
A vigorous B tedious C flat D harsh
ceremony n. 典礼，仪式；表达在某个典礼上介词用at。 vigorous adj. 强劲有力的，强有力的。
harsh adj. 刺耳的，令人不愉快的； flat adj. 平淡无奇的； tedious adj. 冗长无聊的。
29. It is useful to be able to predict the extent _C_ which a price change will affect supply and demand. [extent to]
A from B with C to D for
30. Finding a job in such a big company has always been _D_ his wildest dreams.
A under B over C above D beyond
beyond one’s wildest dreams 做梦也想不到。
31. It is not easy to learn English well, but if you _C_, you will succeed in the end.
A hang up B hang about C hang on D hang onto
hang on 坚持，继续下去。
32. It is reported that _C_ adopted children want to know who their natural parents are.
A the most B most of C most D the most of
most单独出现的时候有两种词性要考虑：1 adv. 非常；2 adj. 大多数的。
most of + 名词，表示这些名词中的大多数。 make the most of 充分利用。
34. _D_ before we depart the day after tomorrow, we should have a wonderful dinner party. [Were they to arrive=If they were to arrive]
A Had they arrived B Would they arrive C Were they arriving D Were they to arrive
35. The strong storm did a lot of damage to the coastal villages: several fishing boats were _A_ and many houses collapsed.
A wrecked B spoiled C torn D injured
collapse vi. 倒塌，坍塌； wreck vt. （船只）遭到破坏。
torn原形是tear，n. 眼泪，vt. 撕裂，撕开。
37. As _B_ announced in today's papers, the Shanghai Export Commodities Fair is also open on Sundays.
A being B is C to be D been
1 which前要有逗号与前面句子分开； 2 which引导非限定性定语从句指的是前面整句话的内容。
38. You see the lightning _A_ it happens, but you hear the thunder later.
A the instant B for an instant C on the instant D in an instant
the instant=as soon as 一…就…
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