pollute vt. 污染； spot n. 地点，场所，斑点，污点；v. 使…上有斑点、污点。
spotted dog 斑点狗。 stain v. 弄脏，玷污，染色。

59. The tomato juice left brown _A_ on the front of my jacket.
A spot   B point   C track   D trace

42. I'd rather read than watch television; the programs seem _B_ all the time.
A to get worse   B to be getting worse   C to have got worse   D getting worse
all the time 始终，一直。

43. Convenience foods which are already prepared for cooking are _D_ in grocery stores.
A ready   B approachable   C probable   D available
convenience foods 方便食品； instant coffee/noodle 速容咖啡/速食面。
ready adj. 准备好的； approachable adj. 可接近的，平易近人的，亲切的。
probable adj. 可能的； available adj. 可获得的，可利用的，可支配的。

44. When I caught him _A_ I stopped buying things there and started dealing with another shop.
A cheating   B cheat   C to cheat   D to be cheating

45. It is important that enough money _A_ to fund the project.
A be collected   B must be collected   C was collected   D can be collected

46. Some old people don't like pop songs because they can't _C_ so much noise.
A resist   B sustain   C tolerate   D undergo
tolerate vt. 忍受，容忍； undergo vt. 经历，遭受。

48. _C_ one time, Manchester was the home of the most productive cotton mills in the world. [at one time 曾经，一度]
A On   B By   C At   D Of

49. _A_ it or not, his discovery has created a stir in scientific circles.
A Believe   B To believe   C Believing   D Believed
believe it or not 信不信由你。 creat a stir 引起轰动。

50. Mr. Morgan can be very sad _C_, though in public he is extremely cheerful.
A by himself   B in person   C in private   D as individual
in public 在公众面前； in private 私下单独一个人的时候。