Cho các câu lệnh lặp sau, hãy chỉ ra câu lệnh đúng? (4 Điểm) for i:=10 to 1 do x:=x+2007; for i:=1 to 10; do x:=x+2007; for i:=1 to 10 do x:=x+2007; for i :=1 to 10.1 do x:=x+2007;

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Chia động từ ở thì quá khứ hoặc quá khứ tiếp diễn 1. They (study) ………………………………………. in the library when the fire alarm (go) ………………………………………. off. 2. When I (see) ………………………………………. him. He (wear) ………………………………………. boots. 3. Charles (start) ………………………………………. to build the house last week. 4. At that time my wife (cook) ………………………………………. 5. It (snow) ………………………………………. when I (get) ………………………………………. up this morning. 6. Albert Einstein (die) ………………………………………. in 1955. 7. I (make) ………………………………………. a cake when the light (go) ………………………………………. out. I (have) ………………………………………. to finish it in the dark. 8. He always (wear) ………………………………………. a raincoat and (carry) ………………………………………. an umbrella when he walked to the office. 9. I (share) ………………………………………. a flat with him when we (be) ………………………………………. students. He always (complain) ………………………………………. about my untidiness. 10. Tom (go) ………………………………………. to the office twice yesterday. 11. At the end of the week she (phone) ………………………………………. me that she (return) ………………………………………. 12. He was busy packing, for he (leave) ………………………………………. that night. 13. Yesterday we (listen) ………………………………………. to an interesting play on radio while our mother (prepare) ………………………………………. dinner. 14. Professor John (teach) ………………………………………. English at Harvard for almost 50 years. 15. The wind (blow) ………………………………………. very hard when I (go) ………………………………………. out this morning. 16. I (go) ………………………………………. past her house every day. 17. When I (be) ………………………………………. a child, I (play) ………………………………………. the violin. 18. Mario (work) ………………………………………. in a restaurant when I (live) ………………………………………. in Paris. 19. I (work) ………………………………………. in a factory during the summer of 1976. 20. He (work) ………………………………………. hard all his life.