cho 2 đg thẳng d1;y=-3x+3+1 d2;y=(2k+6)x+2-m,k khác 3 a)xd,m để 2 đg thẳng trùng nhau b, xd,m để ,,,,,,,,,,,,,,,,,,, song song c,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,cắt nhau d,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, vuông góc với nhau

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Exercise I. Put the verb in brackets in the correct form:(2,5 pts) 1. They (go) ……………..home after they (finish) ………………… their work. 2. She said that she (already, see) ……………………. Dr. Rice. 3. After taking a bath, he (go) ………………………….. to bed. 4. He told me he (not/eat) ………………………… such kind of food before. 5. When he came to the stadium, the match (already/ begin) …………………………………. 6. Before she (watch) …………….. TV, she (do)……………………. homework. 7. Alan (have)…….hardly (prepare)…..for dinner when her husband (go) ….home. 8. After they (go) ………, I (sit) ……………….. down and (rest) …………… 9. Yesterday, John (go) ……….. to the store before he (go) …………… home. 10. She (win) ………………………. the gold medal in 1986. Exercise II.Write in active sentences. (1,25 pts) 1. Was this beautiful dress bought by Mary? ……………………………………………………………………………… 2. These old pictures won't be hung in the living room(by me). ……………………………………………………………………………… 3. This factory wasn't built (by the Greens) during the Second World War. ……………………………………………………………………………… 4. This house and these cars are going to be painted by the Greens. ……………………………………………………………………………… 5. The new president will be interviewed on TV (by some people). ………………………………………………………………………………