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2 năm trước
Nguyên tử x có tổng số hạt là 52 trong đó số hạt mang điện chiếm 65.4%.tính số hạt mỗi loại
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Part II: TENSES 1. When I got home I found that water...............................down the kitchen walls A. ran B. was running C. has run D. had been running 2. After he.......................his English course, he went to England to continue his study A. has finish B. had finished C. was finished D. would finish 3. How.........................since we .....................college? A. are you- left B. were you- left C. have you been- have left D. have you been- left 4. I..................much of you lately. We..........................three months ago A. haven’t seen- last meet B. didn’t see- met C. haven’t seen- have meet D. didn’t see- have met 5. The Chinese.......................spaghetti dishes for a long time before Marco Polo.................back to Italy A. made- brought B. have made- brought C. made- had brought D. had been making- brought 6. When I arrived at the meeting the first speaker.................speaking and the audience................... A. just finished- were clapping B. had just finished- had clapped C. had just finished- were clapping D. just finished- had clapped 7. He.............................his job last month and then he..................out of work A. lost- was B. was lost- had been C. has lost- was D. lost- has been 8. In the last hundred years, travelling.......................much easier and more comfortable A. become B. has become C. became D. will became 9. In the 19th century, it.............two or three months to across North America by covered wagon A. took B. had taken C. had been taken D. was taking 10. In the past, the trip...................very rough and often dangerous, but things..........a great deal in the last hundred and fifty years A. was- have changed B. is- change C. had been- will change D.has been- changed Part III: PASSIVE VOICE 1. We can’t go along here because the road........................ A. is repairing B. is repaired C. is being repaired D. repairs 2. The story I’ve just read...................Agatha Christie A. was written B. was written by C. was written from D. wrote by 3. I’m going to go out and................................................. A. have cut my hair B. have my hair cut C. cut my hair D. my hair be cut 4. Something funny ...........................in class yesterday A. happened B. was happened C. happens D. is happened 5. Many US automobiles........................in Detroit, Michigan A. manufacture B. have manufactured C. are manufactured D.are manufacturing 6. A lot of pesticide residue can.........................................unwashed produce A. find B. found C. be finding D. be found 7. We..................by a loud noise during the night A. woke up B. are woken up C. were woken up D. were waking up 8. Some film stars...................difficult to work with A. are said be B. are said to be C. say to be D. said to be 9. Why did Tom keep making jokes about me? – I don’t enjoy........................at A. be laughed B. to be laughed C. laughing D. being laughed 10. Today, many serious childhood diseases...........................by early immunization A. are preventing B. can prevent C. prevent D. can be prevented Part IV: CONDITIONAL CLAUSE 1. “Would you mind if we ___you by your first name?” “Not at all. Please call me Tom.” A. called B. call C. calling D. want to call 2. She can’t get home ___ she has no money. A. unless B. if C. until D. without 3. If I had known your new address, we ___to see you. A. came B. will come C. would come D. would have come 4. If we took the 10:30 train, ___. A. we would arrive too early B. we should arrive too early C. we will arrive too early D. we may arrive too early 5. It’s very crowded here. I wish there ___ so many people. A. aren’t B. weren’t C. haven’t been D. isn’t 6. I wouldn’t go there at night if I ___ you. A. am B. was C. were D. had been 7. If I ___ get a pole, I’ll go fishing. A. can B. could C. may D. might 8. If they had enough time, they ___ head south. A. will B. can C. must D. might 9. If you ___ a choice, which country would you visit? A. have B. had C. have had D. will have 10. Trees won’t grow ___ there is enough water. A. if B. when C. unless D. as

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