trên tia Ox lấy hai điểm P,Q sao cho OP = 3cm,OQ = 7cm
a) P có nằm giữa hai điểm O và Q không?
b)Tính độ dài PQ
c)Trên tia PO lấy điểm I sao cho PI = 1cm,trên tia Px lấy điểm J sao cho PJ = 3cm
Chứng tỏ điểm P nằm giữa hai điểm I và J
d)Tính độ dài IJ và JQ
có vẽ hình
một máy phát điện xoay chiều cho 1 hiệu điện thế ở 2 cực của máy là 2500V . Mốn tải điện đi xa người ta tăng hiệu điện thế lên 30000V bằng cách sử dụng 1 máy biến thế có số vòng dây cuộn sơ cấp là 2000 vòng
a) tính số vòng dây của cuộn dây thứ cấp
b) khoảng cách từ nhà máy điện đến nơi tiêu thụ là 100km, công suất điện cần truyền laf300kw .tính công suất hao phí do tỏa nhiệt trên đường dây dẫn điện , biết mỗi km dây dẫn có điện trở là 0,2 Ω
Tổng số tuổi của bố và con là 54 tuổi, tuổi của con bằng 1/8 tuổi của bố. Hỏi mỗi người bao nhiêu tuổi?
Tổng số phần bằng nhau:
8 + 1 = 9 (phần)
Tuổi bố là:
54 : 9 × 8 = 48 (tuổi)
Tuổi con là:
54 - 48 = 6 (tuổi)
1. - Is Jeff a good student?
- He . I don't know him well, but I heard he got a scholarship for next year.
a. must be b. could be c. is
2. - Do you know where Eva is?
- She at Barbara's house. She said something about wanting to visit after work today, but I'm really not sure.
a. must be b. could be c. is
3. - I stayed up all night finishing this report for the boss.
- You really tired.
- I do.
a. must feel b. might feel c. feel
4. - Where's the leftover chicken from dinner last night?
- I just saw it when I got some ice cubes. It in the freezer.
a. must be b. might be c. is
5. - It's supposed to rain tomorrow.
- I know, but the forecast wrong. Weather forecasts are far from 100 percent accurate.
a. must be b. could be c. is
6. - I heard that Junko has received a scholarship and will be able to attend the university in the fall.
- Wonderful! That's good news. She very happy to have the matter finally settled.
a. must be b. may be c. is
7. - Excuse me. Could you tell me which bus I should take to the City Hall?
- Hmmm. Bus number 63 there. But you’d better ask the driver.
a. must go b. might go c. goes
8. - Which bus should I take to get to the main post office?
- Bus number 39. It right to the post office.
a. must go b. could go c. goes
9. - Do you suppose Mrs. Chu is sick?
- She . I can't think of anything else that would have kept her from coming to this meeting.
a. must be b. may be c. is
10. - Is that Adam's brother standing with him in the cafeteria line?
- It , I suppose. He does look a little like Adam.
a. must be b. could be c. is
11. - Let's be really quiet when we go into the baby's room. The baby , and we don't want to wake her up.
- Okay.
a. might sleep b. might be sleeping c. might have been sleeping
12. - I wonder why the radio is on in the den. No one's in there.
- Grandma to turn it off. She was in the den earlier and was probably listening to it.
a. must forget b. must have forgotten c. must be forgetting
13. A: Where's Angie? Didn't she come back after lunch?
B: I'm not sure where she is. But she the presentation that Human Resources is giving right now.
a. is attending b. could attend c. could be attending
14. A: You're taking Spanish at 8:00 A.M. every day? Why did you choose such an early class?
B: Because Ms. Cardenas is the teacher. She excellent. I've been in the class for a month now, and I don't mind the early hour.
a. should be b. must be c. is
15. A: The meteorologists predicted five major hurricanes for this hurricane season.
B: They wrong, you know. Sometimes they make mistakes.
a. must be b. might be c. are
16. A: Is this chicken in the refrigerator still good?
B: I don't think so. It's been in there for over a month! It spoiled by now
a. may be b. must be c. could be
17. A: Can you tell me if Flight 86 is on time?
B: It is on time, sir. It at Gate B21 in about five minutes.
a. might arrive b. might be arriving c. should be arriving
18. A: Did you know that Mike got a scholarship to State School of Engineering?
B: Yes, I know that! I was the first one he told about it. He very happy.
a. might be b. must be c. is
19. A: Did you know that Li received a scholarship to the City School of Music?
B: No, I didn't. That's great news! He very happy.
a. might be b. must be c. is
20. A: Who's going to win the election?
B: It's a close call. The senator with all his experience, but the opposition candidate is stronger than anyone expected.
a. must win b. must be winning c. should win
21. A: Where's Harold? He's supposed to be at this meeting. Didn't Jim tell him about it?
B: Jim to tell him.
a. must forget b. must have forgotten c. should have forgotten
22. A: This soup has an interesting flavor, but there's too much salt in it.
B: Yes, it is too salty. I so much salt in it.
a. must not have put b. shouldn't have put c. may not have put
1. b
2. b
3. a
4. b
5. b
6. a
7. c
8. c
9. a
10. b
11. b
12. b
13. c
14. c
15. b
16. b
17. c
18. c
19. b
20. c
21. b
22. b
Giúp mik với!!
Complete the sentences with the verbs in parentheses. Write if I + the past tense or the -ing form of the verb. In some sentences, either response is possible, but the meaning is different.
1. A: It's cold in here. Would you mind (close) if I closing the window?
B: Not at all. I'd be glad to.
2. A: It's cold in here. Would you mind (close) if I closed the window?
B: Not at all. Go right ahead. I think it's cold in here too.
3. 
A: You're going to the library? Would you mind (take) if I taking this book back to the library for me?
B: Not at all.
4. A: I'm not feeling well at all. Would you mind (go) if I going home now?
B: Oh, I'm sorry. I hope you can come back when you feel better.
5. A: I'm not feeling well at all. Would you mind (leave) if I now before the visiting hours are over?
B: Oh, of course not. We shouldn't stay more than a short time for a hospital visit anyway.
6. A: I'll be working late tonight, honey. Would you mind (cook) dinner tonight? I'll clean up after dinner.
B: I'd be happy to. About what time do you think you'll be home?
7. A: We have a lot of chicken left over from dinner last night. Would you mind (make)
a chicken salad from the leftovers for dinner tonight? B: No, that'll be good. You make a great chicken salad.
8. A: I'm feeling kind of worn out. Chopping wood in the hot sun is hard on me. Would you mind (finish) the work yourself?
B: No problem, Grandpa. Why don't you go in and rest? I'll finish up.
9. A: Would you mind (use) your name as a reference on this job application?
B: Not at all. In fact, ask them to call me.
10. A: I'd like to apply for the job as department manager. Would you mind (recommend) me to the boss?
B: No. As a matter of fact, I was thinking of recommending you myself.
Một người đứng cách một cột điện 20m. Cột điện cao 8m. Nếu coi khoảng cách từ thể thủy tinh đến màng lưới của mắt người ấy là 2cm thì ảnh của cột điện trên màng lưới sẽ cao bao nhiêu cm? tiêu cự lúc này thể thủy tinh bao nhiêu cm?
1. - Is Jeff a good student?
- He . I don't know him well, but I heard he got a scholarship for next year.
a. must be b. could be c. is
2. - Do you know where Eva is?
- She at Barbara's house. She said something about wanting to visit after work today, but I'm really not sure.
a. must be b. could be c. is
3. - I stayed up all night finishing this report for the boss.
- You really tired.
- I do.
a. must feel b. might feel c. feel
4. - Where's the leftover chicken from dinner last night?
- I just saw it when I got some ice cubes. It in the freezer.
a. must be b. might be c. is
5. - It's supposed to rain tomorrow.
- I know, but the forecast wrong. Weather forecasts are far from 100 percent accurate.
a. must be b. could be c. is
6. - I heard that Junko has received a scholarship and will be able to attend the university in the fall.
- Wonderful! That's good news. She very happy to have the matter finally settled.
a. must be b. may be c. is
7. - Excuse me. Could you tell me which bus I should take to the City Hall?
- Hmmm. Bus number 63 there. But you’d better ask the driver.
a. must go b. might go c. goes
8. - Which bus should I take to get to the main post office?
- Bus number 39. It right to the post office.
a. must go b. could go c. goes
9. - Do you suppose Mrs. Chu is sick?
- She . I can't think of anything else that would have kept her from coming to this meeting.
a. must be b. may be c. is
10. - Is that Adam's brother standing with him in the cafeteria line?
- It , I suppose. He does look a little like Adam.
a. must be b. could be c. is
11. - Let's be really quiet when we go into the baby's room. The baby , and we don't want to wake her up.
- Okay.
a. might sleep b. might be sleeping c. might have been sleeping
12. - I wonder why the radio is on in the den. No one's in there.
- Grandma to turn it off. She was in the den earlier and was probably listening to it.
a. must forget b. must have forgotten c. must be forgetting
13. A: Where's Angie? Didn't she come back after lunch?
B: I'm not sure where she is. But she the presentation that Human Resources is giving right now.
a. is attending b. could attend c. could be attending
14. A: You're taking Spanish at 8:00 A.M. every day? Why did you choose such an early class?
B: Because Ms. Cardenas is the teacher. She excellent. I've been in the class for a month now, and I don't mind the early hour.
a. should be b. must be c. is
15. A: The meteorologists predicted five major hurricanes for this hurricane season.
B: They wrong, you know. Sometimes they make mistakes.
a. must be b. might be c. are
16. A: Is this chicken in the refrigerator still good?
B: I don't think so. It's been in there for over a month! It spoiled by now
a. may be b. must be c. could be
17. A: Can you tell me if Flight 86 is on time?
B: It is on time, sir. It at Gate B21 in about five minutes.
a. might arrive b. might be arriving c. should be arriving
18. A: Did you know that Mike got a scholarship to State School of Engineering?
B: Yes, I know that! I was the first one he told about it. He very happy.
a. might be b. must be c. is
19. A: Did you know that Li received a scholarship to the City School of Music?
B: No, I didn't. That's great news! He very happy.
a. might be b. must be c. is
20. A: Who's going to win the election?
B: It's a close call. The senator with all his experience, but the opposition candidate is stronger than anyone expected.
a. must win b. must be winning c. should win
21. A: Where's Harold? He's supposed to be at this meeting. Didn't Jim tell him about it?
B: Jim to tell him.
a. must forget b. must have forgotten c. should have forgotten
22. A: This soup has an interesting flavor, but there's too much salt in it.
B: Yes, it is too salty. I so much salt in it.
a. must not have put b. shouldn't have put c. may not have put
1. b
2. b
3. a
4. b
5. b
6. a
7. c
8. c
9. a
10. b
11. b
12. b
13. c
14. c
15. b
16. b
17. c
18. c
19. b
20. c
21. b
22. b
Hope you find this helpful
Mọi người giúp em câu 5c với ạ, em cảm ơn
Complete the sentences. Use the appropriate progressive forms of must, should, or may/might/could and the verbs in parentheses.
1. A: Look. Those people who are coming in the door are carrying wet umbrellas.
B: It (rain)
2. A: Why is Margaret in her room?
B: I don't know. She (do) her homework.
3. A: Do you smell smoke?
B: I sure do. Something (burn) in the kitchen.
4. A: The line's been busy for over an hour. Who do you suppose Julio is talking to?
B: I don't know. He (talk) to his parents. Or he (talk)
to his sister in Chicago.
5. A: What's all that noise upstairs? It sounds like a herd of elephants.
B: The children (play) some kind of game. A: That's what it sounds like to me too. I'll go see.
6. A: I need to call Howard. Do you know which hotel he's staying at in Boston?
B: Well, he (stay) at the Hilton, but I'm not sure. He (stay)
at the Holiday Inn.
7. A: What are you doing?
B: I'm writing a letter to a friend, but I (study) I have a test tomorrow.
8. A: Did you know that Majid just quit school and is hitchhiking to Alaska?
B: What? You (joke)
9. A: Did Joe mean what he said about Majid yesterday?
B: I don't know. He (joke) when he said that, but who knows?
10. A: Did Joe really mean what he said yesterday?
B: No, I don't think so. I think he (joke)
