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đưa ra 10 ý tưởng cho sản phẩm khoa học kĩ thuật. những ý tưởng phải thiết thực và thật đơn giản,ko tốn nhiều chi phí.
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1. When we went back to the bookstore, the bookseller _____ the book we wanted. A. sold B. had sold C. sells D. has sold 2. By the end of last summer, the farmers _____ all the crop. A. harvested B. had harvested C. harvest D. are harvested 3. The director _____ for the meeting by the time I got to his office. A. left B. had left C. leaves D. will leave 4. My mother told me she _____ very tired since she came back from a visit to our grandparents. A. was B. had been C. is D. has been 5. Susan _____ her family after she had taken the university entrance examination. A. phoned B. had phoned C. phones D. is phoning 6. How many cities you and your uncle _____ by July last summer? A. visited B. had visited C. did you visit D. had you visited 7. Miss Jane _____ typing the report when her boss came in. A. didn’t finish B. hadn’t finished C. doesn’t finish D. can’t finish 8. Peter was in New York last week; he _____ in Washington D.C. three days earlier. A. was B. had been C. is D. was being 9. Three women, none of whom we _____ before, _____ out of the hall. A. saw-had come B. had seen-came C. saw-came D. had seen-had come 10. They _____ through horrible times during the war years. A. lived B. had lived C. live D. are living

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