Muốn tăng áp suất lên diện tích bị ép ta có thể làm như thế nào ? A: Giảm áp lực lên diện tích bị ép. B: Tăng áp lực và giảm diện tích bị ép. C: Tăng diện tích bị ép. D: Tăng áp lực và tăng diện tích bị ép lên cùng một số lần.

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Ai giúp được câu nào thì giúp mik nha , k càn lm hết đau ! Exercise 1: Put the verbs in brackets. Present simple or present continuous. 1. I (not/belong) ............................... to this particular government committee. 2. Hurry? The bus (come) ............................... (not/want) ................................ to miss it. 3. Martha is a vegetarian. She (not/eat) ............................... meat. 4. I (look) ............................... for the manager. I can ’t find him anywhere. 5. We are successful because we (take) .................................... the time to talk to our customers. 6. John (deaf) ............................... with all the enquiries about sales. 7. At the moment we (make) ............................... a training video for Siemens. 8. (you/know) ............................... what Mr. Brown is doing? He is not in his office. 9. Unemployment (fail) ............................... and is now down to 5.6%. 10. Jane is doing some research in the library. She needs it for a book she (write) ............................... Exercise 2: Put the verbs in brackets: Present perfect or present perfect progressive. (1) 1. How long (you/ know) ......................................... Gerry? 2. You look dirty. What (you/ do) ......................................... all day? 3. How many times (Charles/ visit) ......................................... New York? 4. She (learn) ......................................... French words for hours, but she still doesn’t remember all of them. 5. The children (watch) ......................................... videos for two hours. 6. (he/ study) ......................................... hard today? 7. Sorry, I’m late, (you/ wait) ......................................... for long? 8. We (not/ see) ......................................... Lisa recently. 9. He (write) ......................................... his essay all day, but he hasn’t finished yet. 10. How long (he/ wait) ......................................... for her? Exercise 3: Put the verbs in brackets: Present perfect or present perfect progressive. (2) 1. You took tired. (you/study) ......................................... hard? 2. Mr. Brown is new here, isn’t he? How long (he/work) ......................................... for the company? 3. I (lose) ......................................... my wallet. Have you seen it anywhere? 4. I (read) ......................................... the magazine you lent me, but I (not/finish) ......................................... yet. 5. (you/hear) ................................... the bad news? Simon (break) ................................... his leg! 6. John (write) ................................... his novel since last year. He ................................... the first three chapters. 7. What (you/do) ........................................ I (wait) ........................................ for you for an hour. 8. The painters (paint) ......................................... the town hall since February. They ......................................... (paint) nearly half of it now. 9. I (know) ......................................... Louise for ten years. 10. Mr. Brown (mark) ........................................ the exams all morning, but he (not/read) ........................................ them all.