Question 21. He …… up his mind yet. A. didn’t make          B. hasn’t made                      C. wasn’t making     D. wasn’t made Question 22. The baby …… non-stop for the last two hours. A. was crying            B. has been crying                C. is crying                D. cried Question 23. The beach was so crowded the other day that we ……. difficulty finding empty spot. A. have had               B. have been having             C. had                         D. have Question 24. The Olympic Games…………every four years. A. take place             B. takes place            C. took place                         D. is taking place. Question 25. I have been waiting for you …………... A. since early morning                                B. since 9 a.m             C. for two hours                                           D. All are correct Question 26. We ............there when our father died. A. still lived              B. lived still                 C. was still living                D. were still living Question 27. I.............to New york three times this year. A. have been            B. was                           C. were                                 D. had been Question 28. For several years his ambition............…to be a pilot. A. is                           B. has been                  C. was                                   D. had been Question 29. It was noisy next door. Our neighbors.............a party. A. had                       B. were having            C. had had                            D. have had Question 30. Bad driving often............many accidents. A. caused                  B. had caused              C. causes                              D. has cause Question 31. Look! That man….............to open the door of your car. A. try                         B. tried                          C. is trying                           D. has tried Question 32. When I was young, I............to be a singer. A. want                     B. was wanting            C. wanted                             D. had wanted Question 33. They.............me about it last week. A. was telling           B. told                           C. had told                           D. would tell Question 34. My grandfather............…many years ago. A. had died               B. has died                   C. died                                  D. was dying Question 35. I.........................my son the money for a week. A. gave                      B. given                        C. have given                       D. was given Question 36. I.............the dishwasher on when I heard the shot. A. A. am turning      B. was turning             C. was turning                     D. turned Question 37. There was a time when watching TV …............family entertainment. A. were                     B. was                           C. had been                          D. is Question 38. Last year, they.............22 million TV sets. A. were selling         B. had sold                   C. has sold                           D. sold Question 39. Ted and Amy............for 24 years. A. have been married                                    B. married  C. were married                                              D. has been married Question 40. 1. They …… on the lake when it started to rain so they went home. A. finished      B. finishing          C. were finishing D. are finishing Question 41. Her dad found some money while she …… her suitcase. A. packing      B. package                       C. are packing           D. was packing Question 42. Your brother ……… in Myanma when he met his girlfriend. A. study          B. was studying   C. were study                   D. was study Question 43. His grandma tried cake for the first time while he ………. in China. A. staying        B. is staying                     C. is stayed                        D. was staying Question 44 Her mom ………. in the park when she saw a tree. A. was going               B. went                        C. were going      D. had gone Question 45. What …….. when his mother came? A. were you doing            B. was you doing   C. are you doing   D. have you done Question 46. What did you watch on TV while you …….. dinner last night? A. were having            B. was having C. had                          D.are having Question 47. The police ………. his letter in the post office at that time. A. is sending               B. was sending                        C. sent             D. were sending Question 48. It ………and cloudy when I left Ireland. A. was rain      B. was raining     C. is raining                     D. rained  

Chân trời sáng tạo ngữ văn 10, bài 4 văn bản 2, 3. Tính hàm súc trong văn bản 2, 3 đã được đáp ứng như thế nào? 🥲

Tại sao lại viết CO, Carbon trị 4 mà?

Tại sao Fe + O2---> Fe3O4

Oxi trị 2 còn Fe trị 2,3 mà

/a+b/+/b+c/+/a+c/ = /a+b+b+c+a+c/, có cần điều kiện gì không? 😐

2n đơn, 2n kép là gì?

Phân tích (x+y)^2-2(x+y)+1 thành bình phương một hiệu

Góc A +góc B= 90°. Vậy cosA+cosB có bằng 90°ko?

Cm nếu n lẻ thì n^4+9(9-2n^2) chia hết cho 16