giúp em với câu bị động 36. Have you finished your homework?  37. Why didn’t they help him? 38. How many games has the team played? 39. Where do people speak English? 40. Who are they keeping in the kitchen? 41. How can they open this safe? 42. What books are people reading this year? 43. How did the police find the lost man? 44. Who look after the children for you? 45. How long have they waited for the doctor? 46. What time can the boys hand in their papers? 47. Who lend you this book? 48. How many marks does the teacher give you?

Answer:

36. Have you finished your homework? -> Has your homework been finished by you?
- Yes, my homework has been finished by me.

37. Why didn’t they help him? -> Why was he not helped by them?
- He was not helped by them because they were busy.

38. How many games has the team played? -> How many games have been played by the team?
- The team has played 10 games.

39. Where do people speak English? -> Where is English spoken by people?
- English is spoken by people in many countries around the world.

40. Who are they keeping in the kitchen? -> Who is being kept in the kitchen by them?
- They are keeping the cat in the kitchen.

41. How can they open this safe? -> How can this safe be opened by them?
- The safe can be opened by them using a special code.

42. What books are people reading this year? -> What books are being read by people this year?
- People are reading a variety of books this year.

43. How did the police find the lost man? -> How was the lost man found by the police?
- The lost man was found by the police through a tip from a local resident.

44. Who looks after the children for you? -> Who is looked after by the children for you?
- The children are looked after by their grandparents.

45. How long have they waited for the doctor? -> How long has the doctor been waited for by them?
- They have been waiting for the doctor for 30 minutes.

46. What time can the boys hand in their papers? -> What time can the papers be handed in by the boys?
- The papers can be handed in by the boys before 5 PM.

47. Who lent you this book? -> By whom was this book lent to you?
- This book was lent to me by my friend.

48. How many marks does the teacher give you? -> How many marks are given to you by the teacher?
- I was given 90 marks by the teacher.

Để giải câu hỏi này, ta cần tìm số sản phẩm cộng tối đa bằng cách xác định số lượng chức năng không giống nhau trên phân tử isopren và HBr.

Isopren có một nhóm chức năng khảo sát, do đó có thể tạo ra 8 sản phẩm cộng với HBr. Các sản phẩm cộng có thể xuất hiện ở vị trí khác nhau trên phân tử isopren. Do đó, câu trả lời chính xác cho câu hỏi là A. 8.