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dothanhsang83
2 năm trước
Treo 1 vật vào lực kế thì lực kế chỉ 13N . Vẫn treo vật đó dưới lực kế nhưng đặt vật nằm trong nước thì lực kế chỉ 8N , biết khối lượng riêng của nước là 1000 kg/m3 . Tính thể tích và khối lượng riêng của vật .
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EXERCISE 1: Use the correct form of verbs in brackets. 13. The car (be) ...................... ready for him by the time he (come) ........................... tomorrow . 14. Last night we (watch) ................ TV when the power (fail) ............................. . 15. That evening we (stay) .................. up to talk about the town where he (live) .................... for some years. 16. I (sit) ..................... down for a rest while the shoes (repair) ....................... . 17. London (change) .......................... a lot since we first (come) ................ to live here. 18. While we (talk) ................. on the phone the chidren (start) ......................... fighting and (break) ..................... a window. 19. He used to talk to us for hours about all the interesting things he (do) ................. in his life . 20. I (spend) .......................... a lot of time travelling since I (get) ............... this new job. 21. Mr Ba .................... (visit) Four countries so far . 22. London ........................ (have) a population of eight million people . 23. The Statue of Liberty in New York is a monument . 24. Vietnamese ............................. ( celebrate) the Independence Day on September 09 th. 25. We ........... ( visit) Sydney Opera House for several times . EXERCISE 2 : Choose the best answer among A, B, C, D. 11. I will be happy if he ............. with us. A. had gone B. did go C. went D. goes 12. Ask Hos to come and see me when she .................... her work. A finish B. has finished C. finished D. finishing 13. Turn off the gas . Don't you see that the kettle ........................ ? A. boil B. boils C. is boiling D. boiled 14. Tom and Mary .............................. for VN tomorrow . A. leave B. are leaving C. leaving D. are left 16. He always ........................ for a walk in the evening . A. go B. is going C. goes D. going 17. Her father ......................... when she was staudying in japan. A. working B. works C. is working D. work 18. I..................to the same factory since last year . A. am doing B. have done C. do D. had done 19. Her father ............................. when she was studying in japan. A. dies B. died C. has died D. had died 20. Last week, The teacher ................. us how to use the past prefect tense. A. would teach B. will teach C. taught D. teaching

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