Câu 1 đến 7 trong ảnh Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 8: The last half of the nineteeth century______ a steady improvement in the means of travel. A. has witnessed B. witnessed C. was witnessed D. is witnessed Question 9: George finally succeeded in swimming across the lake at his fourth_____ . A. attempt B. process C. effort D. instance Question 10: He was very lucky when he fell off the ladder. He ______himself. A. could have hurt B. must have hurt C. should have hurt D. would have hurt Question 11:______ her supervisor’s approval, she shouldn’t begin the project. A. Unless Susan doesn’t get B. Were Susan to get C. If Susan gets D. Unless Susan gets Question 12: Modem computer science and artificial intelligence _____in the pre-war work of Goedel, Turing, and Zuse. A. say to root B. say to have rooted C. are said to root D. are said to have rooted Question 13: Students are _____less pressure as a result of changes in testing procedures. A. under B. above C. upon D. out of Question 14: Tom is getting ever keener on doing research on ______. A. biology B. biological C. biologist D. biologically Question 15: The most ______mineral derived from the sea is sodium chloride or common salt. A. insufficient B. sufficient C. generous D. plentiful Question 16: A number of young teachers nowadays____ themselves to teachingdisadvantaged children. A. offer B. stick C. give D. devote Question 17: Cutting in lines at the grocery store, for example, or being habitually late for meetings is considered behavior. A. suitable B. unnecessary C. appropriate D. rude Question 18: Sorry for being late. I was_______ in the traffic for more than an hour. A. carried on B. held up C. put off D. taken after Question 19: She was tired and couldn’t keep ______the group. A. up with B. up against C. on to D. out of Question 20. Michael rarely returns to his hometown, ______ ? A. doesn’t he. B. hasn’t he. C. does he. D. has he. Question 21. Only after he ______the job as a computer programmer did he realise how much he loved it. A. would leave. B. was leaving. C. had left. D. has left.