mình đang cần gấp lắm ạ II. Turn the following sentences into the active voice. 36. These artificial flowers are made of silk. 37. The lessons are being written by the students now. 38. This job has to be done at once. 39. These animals at the zoo are fed twice a day. 40. The operation is going to be performed by French doctors. 41. All the arrangements have been made. 42. When was this radio manufactured? 43. They couldn't found anywhere. 44. Is mathematics taught in this school? 45. Fortunately the machinery wasn't damaged by the accident. 46. Please wait here while your luggage is being examined. 47. How are candles made?

36.These artificial flowers are made of silk.

⇒They make these artificial flowers of silk.                        

37. The lessons are being written by the students now.

⇒The students are writing the lessons now.
39.These animals at the zoo are fed twice a day.

⇒They feed these animals at the zoo twice a day.               
40. The operation is going to be performed by French doctors.

⇒French doctors are going to perform the operation. 
42. When was this radio manufacture?
⇒ When did they manufacture this radio?
43. They couldn't be found anywhere.
⇒People coulgn't find they anywhere.
44.Is mathematics taught in this school?
⇒Are they teach mathematics in this school?
45. Fortunately the machinery wasn't damaged by the accident.
⇒The accident didn't damaged the machinery fortunately.
46.Please wait here while your luggage is being examined?
⇒Please wait here while they is samining you luggage?
47.How are candles made ?
⇒How do they make candles?