kể tên 10 loài thực vật khác nhau dễ kiếm dễ tìm quanh ta

Vãi trò của rừng trong việc hạn chế lũ lụt,hạn chế như thế nào?. Trả lời ngắn gọn thôi nha,nhưng đủ ý Mik cho trả lời hay,5 sao

dàn ý chi tiết về ô nhiễm môi trường ở quận ngũ hành sơn

ngày trái đất là ngày bao nhiêu

Đặt câu điều kiện từ ''If'' sang ''because'' cho mk VD 10 câu nha

Cho số tự nhiên n biết ƯC(24,120)=Ư(n). Giá trị n thỏa mãn là

...............…........ giúp mình nhanh với ạ

Hôm nay bị thầy chửi vì không biết mệnh đề là gì... Cho iem nó xin ý kiến về mệnh đề với ạ( Cấu trúc, ví dụ)

26. This is the house that Jack ______ three years ago. A. was building B. builds C. had built D. built 27. He ___________ the effects of radiation when he suddenly died A. was studying B. studied C. had been studying D. has studied 28. The train ______ when I ______ at the station. A. already left / had arrived B. already had left / arrived C. left already / had arrived D. had already left / arrived 29. Everyone was asleep when the enemy _____________ A. had attacked B. attacked C. was attacking D. attacking 30. Don't make noise. My mother ________________with her friends. A. talked B. talks C. is talking D. was talking 31. She ______ the piano since she ______ ten years old. A. played / was B. has played / has been C. has played / was D. had played / was 32. Up to now, I _________________ a lot of information about her. A. learnt B. would learn C. learn D. have learnt 33. Mary ___________ in London for 15 years. A. lives B. was living C. is living D. has lived 34. We were disappointed that most guests ___________ when we arrived at the party. A. had left B. has left C. left D. leave 35. He never goes home before he ______ his work. A. finished B. has finished C. had finished D. finishing 36. Before cars ______, people ______ horses and bicycles. A. were discovered / had used B. has been discovered / have been using C. is discovered / using D. discovering / used 37. I ______ my writing by 3 o'clock this afternoon. A. will finish B. finish C. will have finished D. finished 38. How ______ since we ______ school? A. will you / left B. are you / left C. have you been / had left D. have you been / left 39. When I last ___________ Jane, she ____________ to find a job. A. have seen/ tried B. saw/ tried C. see/ is trying D. saw/ was trying 40. Next week when there ______ a full moon, the ocean tides will be higher. A. is B. will be C. is being D. will have been 41. I sat near a window whenever I ______ a bus. A. have taken B. had took C. took D. take 42. When I last saw him, he _________in London. A. is living B. was living C. has lived D. has been living 43. We ________________Mary since last Saturday. A. don't see B. hadn't seen C. didn't see D. haven't seen 44. The train __________________haft an hour ago. A. has left B. had left C. left D. has been leaving 45. By Christmas, I ________________for Mr. Smith for six years. A. shall have been working B. shall be working C. shall work D. have been working 46. I'll come and see you before I ____________for HCM City. A. will leave B. shall leave C. have left D. leave 47. Jack ___________ the door. A. has just opened B. opening C. open D. will have opened 48. By the age of 25, he ________________two famous novels. A. had written B. has written C. writes D. wrote 49. After I ____________lunch, I looked for my bag. A. have had B. had had C. had D. was having 50. The man got out of the car, ______round to the back and opened the door. A. walk B. walking C. walks D. walked 51. Before you asked, the letter ________________. A. has been written B. was written C. had been written D. had written 52. I ______________in Hanoi before I moved to HCM City. A. had been living B. had lived C. have lived D. have been living

Cho đường tròn ( o ,r) Và điểm m cố định nằm ngoài ( o ,r) Từ m kẻ các tiếp tuyến MA ,MB