Vật liệu có thể đóng vào trò “chất làm chậm” tốt nhất đối với nơtron là:

A. kim loại nặng

B. than chì

C. khí kém

D. bê tông

Forms of the verbs : V-ing / To - Infinitive / Bare - Infinitive

1. Don’t forget (lock) to lock the door before going out

2. She suggested (go) going to the cinema.

3. A big dog made a little girl cry (cry)

4. You don’t let your younger brother (see) seeing this present.

5. He advised me (not sit)………………. . . . near the window.

6. We are trying ……………. the report on time. (finish)

7. I didn’t like her so I turned left to avoid (meet)…. …………. . . her.

8. Have you finished (read). . ……………… the book I lent you last week ?

9. Whenever they meet each other, they stop ………………. . (talk)

10. It stopped (rain) ………………. we could go out.

11. He continued (talk) ……………, she kept ………………. . (laugh)

12. Nam likes (listen)…………………. . to music in the evening.

13. After driving course, he will be able (drive) …………… a car.

14. The tourist needs (find)……………. . the police station because he’s lost money.

15. My mother is busy (cook)……………. every day. 16. I don’t enjoy (play)………. . . . . . . . ……basketball

17. After filling the form, please ……. . . . . . . . . . . . . . . …… it back to me. (bring)

18. We are glad …………. . . . . . . . . . . . . . . . …. you that we are going to have interesting activities. (tell)

20. The police don’t allow anyone …………. . . . . . . . . . . . . . . ……out of the room. (go)

21. Whenever we met, Jack avoided (look) ……. . . . . . . . . . . . . . . . . . . ………. at me

22. Alice needs (find) ……. . . . . . . . . . . . . . . . . . . . . …. another job. Her present company is going out of business.

23. I hope (write) …………. . . . . . . . . . . . . . . . . my autobiography before he dies. Do you think anyone would read it ?

24. My lawyer advised me not (say) ……. . . . . . . . . . . . . . . . . . . ……. . anything further more about accident.

25. You should plan (arrive) …………. . . . . . . . . . . . …. . at the stadium early or you won’t be to get good seats.

26. My mom asked me (pick) ………. . . . . . . …… up some eggs at the supermarket on my way home from work.

27. Nobody has offered (buy) ………. . . . . . . . . …. the house next door, so I think they’re going to lower the price.

28. The city council agreed (accept) ……. . . ……… the architect’s proposed design for a new parking garage.

29. John was trying (unlock)………. . . . . . . . . ………. the door with the wrong key.

31. Lillian prefers (walk) ………. . . . . . . . . . . . . . ………. to taking the bus.

32. Tim prefers (walk) …………. . . . . . . . . . . . . . . . . ……. . than to jog for exercise.

33. Alex will never forget (take) ……. . . . . . . . . . . . . . . . ………. his first helicopter ride.

34. Would you please remember (put) ……… away all the tapes when you’ve finished listening to them ?

35. I remembered (put) …………. . them away when I finished with them last night.

36. I remembered (visit) …………. Bolivia for the first time. It’s s beautiful country.

37. What am I going to do ? I forgot (bring) ………. . . my calculus text, and I need it for the review today.

38. I always try (pay) …………. . my bills on time, but sometimes I am a little late.

39. I persuaded my brother in-law (anh rể) (not buy) …………………. that old car.

40. My father expects me (get) ……………. high marks in school. .

41. For some strange reason, I keep (think) ………………. . today is Saturday.

42. All of the members agreed (attend) ………………… the emergency meeting. (cuộc họp khẩn cấp)

43. My roommate says I have a terrible voice(giọng), so I stopped (sing) ………………. . in the shower.

44. Did the doctor mention (avoid) ………………… any food in particular ?

45. The cashier always remembers (count) ……………… the money in her cash register each day before

46. They discussed (open) ……………. a new business. she leaves work.

47. Let’s hurry! We must finish (paint) …………. . the office before 3;00 this afternoon.

48. She stopped (go) …………. to classes when she got sick. (ném)

49. I finally completed (write) …………. my term paper. 50. The athlete practiced (throw) ………. . the ball

51. She failed (return) ………………. the book to the library on time.

52. She managed (finish) …………. her work early. 53. We prepared (welcome) ……………. . them.

54. Her laziness caused her (fail)………. . 55. She reminded me (lock) …………. . the door.

56. She suggested (listen) ……… to soft music. 57. I am used to (stand) ……… in queues (xếp hàng)

58. The children prefer (watch) ………. . . . . . . . . . ……. . TV to (read) ………………

59. You’ll soon get used to (drive) ………………. on the right, Mary.

60. He stopped (work) ……………… because he was very tired.

61. It takes him 30 minutes (swim) ………………. . every morning.

62. Would you like (come) ………… to a party ?

63. After (phone) ………………. An went out. 64. She ran 5 miles without (stop) …………….

65. Would you mind (lend) …………. me $5 ? I forgot (cash) ………………. . in cheque.

66. Peter used (go) …………. . to the zoo when he was a child.

67. The only way of (cross) ………………. the river is by (swim) ……………. .

68. Please come on time. I hate to be kept (wait) …………………

69. I am not used to (get) …………. . up early, I’d rather (stay) …………. in bed a bit longer.

70. He says he doesn’t remember (promise) …………………… (help) ……………. . you.

71. Paradon me for (be) ……………. . late. It is very kind of you (wait) ……………. for me.

72. Try (finish) ……………. . it. It is no use (explain) ……………………

73. Fashion makes me (spend) ………………… too much money on clothes.

74. My sister is busy (write) ………………a letter. 75. Please let him (go) ………. . with me.

76. Don’t hurry ! There’s no need (run) ……………….

77. I chose(chọn) (go) ……………. . to Stanford University for my undergraduate studies

78. You must keep (practice) ………………on the computer until you understand how to use all of the

79. I dislike (drive) …………………. long distances. programs.

80. Jack got into trouble when he refused (open) ……………his briefcase for the customs officer.

Tấm lọc màu có công dụng

A. chọn màu ánh sáng truyền qua trùng với màu tấm lọc.

B. trộn màu ánh sáng truyền qua.

C. giữ nguyên màu ánh sáng truyền qua.

D. ánh sáng truyền qua chuyển sang màu sáng hơn.

Trong phóng xạ β -  có sự biến đổi:

A. Một n thành một p, một e- và một nơtrinô.

B. Một p thành một n, một e- và một nơtrinô.

C. Một n thành một p , một e+ và một nơtrinô.

D. Một p thành một n, một e+ và một nơtrinô.

Chiếu chùm ánh sáng trắng qua một kính lọc màu tím, chùm tia ló có màu:

A. đỏ

B. vàng

C. tím

D. trắng

169. He didn’t like (leave) leave . children alone in the house but he had no alternative (không có cách) as he had (go) go out to work.

170. Why didn’t you drink it ? - I didn’t like (drink) drink it as I didn’t know what it was.

171. Do you feel like (go) going to a film or would you rather (stay)stay . at home ?,

172. She told me (look) looking through her correspondence(thư từ) and (take) take out any letters that you had written her. I didn’t like (look)looking through someone else’s letter but I had (do) does . as she said.

173. I liked (listen) listening to folk music than (listen) listen . to pop

174. The car began (make) make . an extraordinary noise so I stopped (see) see what it was.

175. He decided (put) put . broken glass on top of his wall (prevent) ……. prevent . boys (climb) climb . over it. (miếng bánh)

176. He annoyed me very much by (take) take the piece of cake that I was keeping (eat). …. . eating. . . . . . after my supper. (bữa cơm tối)

177. He kept (ring) ring . up and (ask) asking for an explanation and she didn’t know what (do) does about him.

178. We got tired of (wait) wait … the weather (clear) clear and finally decided (set) set . out(khởi hành) in the rain.

179. He made me (repeat) …………. his instructions (make) ……………. . sure that I understood what I was (do)…………. . after he had gone.

180. She apologized (xin lỗi) for (borrow) ………………. . . my sewing machine without (ask) ………. . permission and promised never (do) ……………. it again

181. You don’t need (ask). . . . . . . . . . . . . . . . his permission every time you want (leave) ………………the room.

182. I left my door open. Why didn’t you walk in ?

- I didn’t like (go) …………… in when you weren’t here.

183. Try (avoid) ……………… (be) …………. . late. He hates (be) ………… kept (waiting) ………

184. I didn’t know how (get) ……………. to your house so I stopped (ask) …. . …………. . the way.

185. Did you advise him (go) …………… to the police ?

- No, I didn’t like (give) …………. . any advice on such a difficult matter.

186. I caught him (climb) ……………. over my wall. I asked him (explain) ……………. but he refused (say) …………… any thing, so in the end I had (let) ……………. . him (go) ………….

187. Jame nees (see). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a docotr soon.

188. I can’s afford (go). . . . . . . . . . . . . . . . . . . . . . . . . . . out tonight. I haven’t got enough money.

189. Can you remind me (buy). . . . . . . . . . . . . . . . . . . . . . . . . some coffee when we go out ?

190. One of the boys admitted (break). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . the window.

191. How did the thief get into the house ?

- I forgot (shut). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . the window.

192. It’s a nice day, so we decided (go). . . . . . . . . . . . . . . . . . . . . . . . . for a walk.

193. It’s a nice day. Does anyone fancy (go). . . . . . . . . . . . . . . . . . . . . for a walk.

194. I still looking for a job but I hope (find). . . . . . . . . . . . . . . . . . . . . . . . . . . something soon.

195. I was lonely at first, but after a time I got used to (live). . . . . . . . . . . . . . . . . . . . . . . . . . . . . alone.

196. Did you remember (lock). . . . . . . . . . . . . . . . . . . . . . . . . the car ?

- No, I didn’t. I’d better (go). . . . . . . . . . . . . . . . . . . back and (do). . . . . . . . . . . . . . . . . . . . . . . . . it now.

197. Would you like me (turn). . . . . . . . . . . . . . . . . . . . . . . . down the radio a bit ?

- No, it’s all right. I’m used to (work). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . with the radio on.

198. Would your children mind (keep). . . . . . . . . . . . . . . . . . . . . quiet for a moment ? I’m trying (fill). . . . . . . . . . . . . . . . . . . a form.

199. If you want the milkman (leave). . . . . . . . . . . . . . . . . . . . . . . . . you milk in the morning, don’t forget (put). . . . . . . . . . . . . . . . . a milk bottle outside.

200. Nothing will make me (change). . . . . . . . . . . . . . . . . . . . . . . . . . . . . my mind.

Chọn câu đúng. Các tia có cùng bản chất là:

A. tia   γ và tia tử ngoại

B. tia  α và tia hồng ngoại.

C. tia âm cực và tia Rơnghen.

D. tia  α và tia âm cực.

71. Paradon me for (be) ……………. . late. It is very kind of you (wait) ……………. for me.

72. Try (finish) ……………. . it. It is no use (explain) ……………………

73. Fashion makes me (spend) ………………… too much money on clothes.

74. My sister is busy (write) ………………a letter. 75. Please let him (go) ………. . with me.

76. Don’t hurry ! There’s no need (run) ……………….

77. I chose(chọn) (go) ……………. . to Stanford University for my undergraduate studies

78. You must keep (practice) ………………on the computer until you understand how to use all of the

79. I dislike (drive) …………………. long distances. programs.

80. Jack got into trouble when he refused (open) ……………his briefcase for the customs officer.

81. Sam always remembers (park) parking in the garage so that the driveway is free for other cars

82. I finally finished (cook) cooking 7:00 pm and served dinner.

83. The nurse suggested (take) taking two aspirin.

84. When I had to make an emergency phone call, the secretary let me (use) use her phone

85. Don’t forget (phone) to phone home as soon as you arrive at your destination.

86. The painting was beautiful. I stood there (admire) to admire it for a long time.

87. Jack made me (promise) promise to (call) call him next week.

88. We are looking forward to (meet)meetting my old friend at the party.

89. Long offered (take) to take care of my garden while I was out of town

90. If we leave now for our trip, we can drive half the distance before we stop (have)to have lunch

91. The teacher decided (accept) to to accept the paper.

92. She refused (accept) to accept the gift.

93. His father doesn’t approve (tán thành) of his (go) going to Europe

94. We found it very difficult (reach) to reach. a destination.

95. Mary regrets (be) being the one to have to tell him.

96. I hope(have) to have a job.

97. It’s no use (wait) waiting

98. Try to avoid (make)making him angry.

99. Please let me (know) know your decision

100. I hate(see) seeing a child (cry) crying

101. Stop (argue) arguing . and start (work) to work

102 He used (smoke) to smoke 40 cigarettes a day.

103. The snow keeps (fall) falling

104. I’m sorry (disappoint)(làm thất vọng) to disappoint you

105. I’d like (have) to have a look at your new car. (chạm vào)

106. I am looking forward to (see) seeing you.

107. He warned her (not touch)not to touch the wire.

108. Would you mind (show)showing me how (work) to work the lift ?

109. Stop (talk) talking I’m trying (finish) to finish a letter.

110. There are some people who can’t help (laugh) laughing when they see someone slip on a banana skin.

111. He told me (try) try to (come) come early. .

112. Ask him (come) to come in. Don’t keep him (stand) standing at the door.

113. Is there anything here worth (buy) to buy ?

114. Oh ! I can feel something (craw)(bò) crawing up my leg. It must be an insect. (côn trùng)

115. Can you smell (ngửi)something (burn) (cháy) burned ?

116. You’ll be able (do) to do it yourself when you are older.

117. He is too ill (eat) to eat anything.

118. I prefer (drive) driving to (ride)riding.

119. I don’t enjoy (go) going to the dentist.

120. You’ll never regret (do) to do . a kind action.

121. I ‘ll remember (send) to send you a postcard when I reach London

Phát biểu nào sau đây là sai.khi nói về sự phóng xạ?

A. Trong phóng xạ   β + , hạt nhân mẹ và hạt nhân con có số khối bằng nhau, số nơtron khác nhau.

B. Trong phóng xạ α , hạt nhân con có số nơtron nhỏ hơn số nơtron của hạt nhân mẹ.

C. Trong phóng xạ β - , hạt nhân mẹ và hạt nhân con có số khối bằng nhau, số prôtôn khác nhau.

D. Trong sự phóng xạ, có sự bảo toàn điện tích nên số prôtôn được bảo toàn.