1.　 A. make sure　　　 　　 B. look at 　　　　　　 C. write down　　 D. find out

50. A. borrow　　　　 B. buy　　　　　　　　　 C. lend　　　　　　　　　 D. take

What time is it? There are many ways you can (1)　 　the time. You may have a watch on your wrist(手腕) .You can look at a clock on the wall. You can listen to the radio or 　(2) 　a number on the telephone to get the time.

I has not always been (3)　 　to know the time. A long time ago people looked at the　　 (4) to tell the time. They could tell the time by looking at it in the sky: morning, noon or afternoon.

Around the year 1400, people began to use the hourglass(沙漏) . It was made (5) glass with sand in it. It was wide at both ends, (6) narrow ( 窄的) in the middle. The sand ran from one end to (7) in one hour. At the end of every hour people turned the glass over ant it began (8) .

Hundreds of years later a machine called　 (9) 　　was invented. After that people made　　　 (10)　 clocks so that they could　 　(11)　 　　them in their pockets. These pocket clocks were called watches. Then, during the first world war (战争) men started (12) 　　their watches on their wrists. It was easier and faster to tell the time.

49. A. But　　　　　　 B. However　　　　　 C. So　　　　　　　　　　 D. Still

48. A. return　　　　　 B. return back　　　　 C. reach　　　　　　　　 D. arrive

47. A. where　 　　 B. which　　　　　　　 C. what　　　　　　　　 D. why

46. A. also　　　　　　 B. too　　　　　　　　　 C. either　　　　　　　　 D. then

45. A. new　　　　　　 B. modern　　　　　　 C. latest　　　　　　　　 D. useful

44. A. look　　　　　　 B. just　　　　　　　　　 C. feel　　　　　　　　　 D. something

43. A. hear　　　　　　 B. listen to　　　　　　 C. read　　　　　　　　　 D. play

42. A. that　　　　　　 B. how　　　　　　　　　 C. if　　　　　　　　　　　 D. which