49. You shouldn’t have written in the ______ since the book belongs to the library.

　　A) interval B) border

　　C) margin D) edge

　　50. The ______ of airplane engines announced a coming air raid.

　　A) roar B) exclamation

　　C) whistle D) scream

　　51. This ticket ______ you to a free boat tour on the lake.

　　A) entitles B) appoints

　　C) grants D) credits

　　52. This is the nurse who ______ to me when I was ill in hospital.

　　A) accompanied B) attended

　　C) entertained D) shielded

　　53. I was about to ______ a match when I remembered Tom’s warning.

　　A) rub B) hit

　　C) scrape D) strike

　　54. The advertisement says this material doesn’t ______ in the wash, but it has.

　　A) contract B) shrink

　　C) slim D) dissolve

　　55. He was proud of being chosen to participate in the game and he ______ us that he would try as hard as possible.

　　A) insured B) guaranteed

　　C) assumed D) assured

　　56. Not only the professionals but also the amateurs will ______ from the new training facilities.

　　A) derive B) acquire

　　C) benefit D) reward

　　57. The work was almost complete when we received orders to ______ no further with it.

　　A) progress B) proceed

　　C) march D) promote

　　58. I waited for him half an hour, but he never ______.

　　A) turned in B) turned down

　　C) turned off D) turned up

　　59. A house with a dangerous gas ______ can be broken into immediately.

　　A) leak B) split

　　C) mess D) crack

　　60. A dark suit is ______ to a light one for evening wear.

　　A) favourable B) suitable

　　C) preferable D) proper