Câu 4: Cho 4,6g natri vào nước, sau đó cho giấy quỳ tím vào thu được dung dịch Natri hiđroxit và khí hiđro. a) Nêu hiện tượng – viết PTHH Câu 5: Đốt một lượng photpho trong không khí thu được 17,04 g điphotpho pentaoxit (P2O5) a) Nêu hiện tượng – viết PTHH Câu 6: Cho một lượng Magie tác dụng vừa đủ với dung dịch Axit clohiđric (HCl) thu được 4,48 lit khí hiđro và m(g) muối Magie clorua (MgCl2). Sau đó dẫn khí sinh ra vào bột CuO, đun nóng thấy xuất hiện chất rắn màu đỏ gạch là kim loại đồng. a) Nêu hiện tượng – viết PTHH.

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Exercise 4: 1. Miss Lee often (write) ---------------------- when he (be) ----------------------young. 2. He (leave) ----------------------home two weeks ago 3. You (speak) ---------------------- to Mrs. Bakers yesterday? 4. Columbus (discover) ----------------------America more than 400 years ago. 5. I (not can) ---------------------- remember when I last (see) ---------------------- her. 6. When Nguyen Du (die) ----------------------? - I (not know) ----------------------when he (die) ----------------------. 7. Hurry up! The train (come) ----------------------. 8. Be quiet! The teacher (be) ----------------------angry. 9. Some animals (not eat) ----------------------during winter. 10. Listen! The bird (sing). ---------------------- Exercise 5: 1. I (finish) ----------------------the book before my next birthday. 2. The house (build) ---------------------- two years ago. 3. Someone (cut) ----------------------down all the trees in the garden. 4. Tom Baker (not come) ----------------------here tomorrow. 5. He often (say) ----------------------O.K. when he (talk) ---------------------- with the quests. 6. What you (do) ---------------------- after you (go) ----------------------home yesterday? 7. Yesterday thieves (break) --------------- into the house and (steal) ------------- a lot of fur coats 8. The audience (listen) ----------------------to everything he said last night. 9. I’m preparing to support anything he (say) ----------------------tomorrow. 10. Sometimes I (get) ----------------------up before the sun (rise) ----------------------. Exercise 6: 1. Don’t speak until someone (ask) ----------------------you. 2. Please be quiet! I (work) ----------------------. 3. When I (be) ----------------------a child, I (want) ---------------------- to be a doctor. 4. The last train (leave) ----------------------the station at 5 p.m. 5. I (meet) ----------------------her at the movie theater last night 6. He (go) ------- to the English club every Sunday. But last Sunday he (not go) ------------there 7. We (travel) ---------------------- to Hue next morning 8. They usually (have) ---------------------- dinner at home, but they (have) ---------------------- dinner in a small restaurant yesterday evening 9. He (brush) ---------------------- his teeth every night, but last night he (forget) ----------------------to brush them 10. My father (not like) .............................drinking wine. He prefer (drink).........beer Exercise 7: 1. When I (be)....................a child. I (drink).....................a lot of milk 2. My family often (go)..............out for a dinner at the weekend 3. She’d like (tell)............................funny stories 4. She prefers (play) .............................piano 5. Nga prefers (listen) .......................rock music to (listen)..................pop music 6. I prefer (take)......................part in sport to(watch)..................them 7. The students prefer (gather)....................in the streets. 8. When Mai (be).................young ,She (like)................(go)..................to the zoo to see animals 9. At the moment we (sit)………. in a cafe. We (wait) …………….for the museum to open 10. Thanks for (invite)……………………. me to the birthday party. Exercise 8: 1. My sister (buy) ----------------------a new book yesterday morning. 2. Where they (spend) ----------------------their summer vacation next year ? 3. What you (think) ----------------------Tom (do) ----------------------? - He (tell) ----------------------the truth to his parents. 4. You(wait) ----------------------a minute while I (look) ----------------------through the test ? 5. After the party tonight I (speak) ----------------------to you about your future job. 6. Don’t make too much noise. I ( do) ----------------------this math question. 7. Now I (understand) ----------------------what you are trying ( say) ----------------------. 8. I’m afraid I not (be) ---------------------- quite ready. – Never mind. I (wait) ------------------- 9. At the moment we (sit) ----------------------in a café, we 9 wait) for the museum to open, so I (write) ----------------------some postcards. 10.Miss Helen (help) ----------------------as soon as she (finish) ----------------------that letter.