23.__________ Charlotte left her office__________ she find that she forgot to lock the office door.
(A) No until. . . did
(B) Until... did not
(C) Not until .. . did
(D) Until . . . did

19.__________ he__________ in the room, he could have read the emotions on her face at a glance. (A) Had...been (B) Is...been (C) Was...been (D) Wasn't....been

20. Customers should not have to contend__________ the probiems caused by these delays. (A) to (B) with (C) from (D) on

21. He had told us he felt nervous about the performance, but he seemed perfectly __________ when he walked onto the stage. (A) composes (B) to compose (C) composing (D) composed

22. This new product offers many advantages: speed, convenience, and durability,__________ . (A) but only (B) to name but a few(C) just only (D) completely done

24. This scientist finds out how to treat a terrible disease successfully. He is a hero__________ we feel great respect. (A) for whom (B) whoever (C) where(D) for what

25. When his car makes some strange noise, Martin stops__________whether something goes wrong. (A) and checking (B) checks (C) checking (D) to check

26. What details does the author of this passage use to illustrate how popular mountain-climbing is in South Korea? (A) How many people own hiking boots (B) How many people visit South Korean national parks (C) How many people wait for a chance to take a photo near a peak (D) All of the above.

27. According to this passage, which of the following sentence CANNOT explain why South Koreans love mountain-climbing? (A) South Koreans think that the mountain god is their ancestor. (B) There are too many national parks in South Korea. (C) Mountains in South Korea are not too high. (D) Climbing mountains in Scoul is not very time-consuming.

28. Why do many South Koreans prefer climbing mountains efficiently? (A) because they are physically weak (B) because they do not have enough money (C) because they spend a lot of time working and have shont holidays (D) because they follow the rules of the government to do so

29. Which of the following sentences correctly deseribes the opinion of Ms. Park and Mr. Choi towards efficient mountain climbing? (A) Both think that it is misguided to insist on climbing mountains eficiently. (B) Both approve of the practice of climbing mountains eficiently. (C) Ms. Park criticizes efficient mountain-climbing, while Mr. Choi supports it. (D) Mr. Choi criticizes efficient mountain-climbing, while Ms. Park supports it