Một trường tổ chức cho khoảng từ 800 đến 950 học sinh khối 6 và khối 8 đi tham quan. Tính số học sinh đi tham quan, biết rằng nếu xếp hàng 20, 25, 30 đều thừa ba học sinh, nhưng khi xếp hàng 43 thì vừa đủ.

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18. Oxford University is the most ancient university in Britain. TÌM TỪ ĐỒNG NGHĨA A. biggest B. youngest C oldest D. most famous 19. Home appliances have changed very much during the past few years. A. devices B. toys C. machine D. furniture 20. After a long working day, I want to stay in my comfy bed and watch my favourite channel. A. warm B. comfortable C. large D. soft 21. The development of cities is becoming faster and faster and this causes wildlife animals’ homes disappear. A. reason B. make C. do D. purpose 22. Everyone can save power by unplugging the home appliances when they’re not in use. A. turn in B. switch on C. switch off D. turn on 23. I think robots now cannot do complicated things or communicate with people. A. easy B. difficult C. simple D. uncomplicated 24. One of the best things about robots is their ability to do jobs that would be just dangerous for people. A safe B. risky C. secure D. safety 25. Their funny stories make us laugh a lot. A. amusing B. lovely C. cute D. reliable 26. We organize expensive furniture carefully. A. act B. show C. watch D. arrange 27. Try' to be quick! We're late already. A. slow B. fast C. long D. short 28. Our city was polluted with the exhaust fumes emitted from vehicles. A. clean B. populated C. popular D. dirty 29. She has walked almost 1,000 steps today. A. just B. over C. nearly D. fast 30. The Olympic Games are held every four years. A. carried B. taken C. brought D. organized 31. I'm not comfortable to live in my new house in the city center. It's crowded with-people. A. packed B. quite C. noisy D. many 32. When I came to Da Nang, I ate many local foods which are very delicious. A. national B. regional C. international D. provincial 33. Hopefully the tree will produce some blossom next year. A. trunk B. branch C. flower D. root