mình con tần này điểm thôi mong mng giúp vs ạ Exercise 21 : Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. Question 1 : She_____the letter a few moments before my call came through. A. has just opened B. had just opened C. just opened D. just opens Question 2 : As soon as the boys_____the hall they_____to speak about books and writers. A. entered/begun B. were entering/began C. entered/began D. had entered/beganQuestion 3 : While we_____dinner at a restaurant someone came to the house and _____this note. A. had had/ left B. were having/left C. had/left D. were having/had left Question 4 : By the end of this year we_____a new house. A. will buy B. will be buying C. will have bought D. had bought Question 5 : “You always_____mistakes, you need_____the instructions more carefully.” A. make/read B. are always making/read C. make/to read D. are always making/to read Question 6 : Those students who_____the exam are going to take another one held in August. A. have failed B. failed C. had failed D. were failing Question 7 : I_____your brother this afternoon at Green Street. A. met B. had met C. was meeting D. have met Question 8 : She said she met you once at the Hilton last year._____since then? A. Have you met her B. Did you meet her C. Were you met her D. Had you met her Question 9 : Mr. Edwards_____history for 35 years, and is retiring soon. A. teaches B. is teaching C. taught D. has been teaching Question 10 : I’m tired. I_____the house since 9 this morning. A. am cleaning B. was cleaning C. had been cleaning D. have been cleaning Question 11 : I can’t believe that you_____all the three exercises. You just started five minutes ago. A. have finished B. have been finishing C. finished D. are finishing Question 12 : “How’s Peter doing?” “I don’t know. I_____from him for months.” A. have to hear B. haven’t heard C. didn’t hear D. don’t hear Question 13 : Their children_____lots of new friends since they_____to that town. A. have made - moved B. were making - have moved C. made - are moving D. made - have been moving Question 14 : He_____a cigarette and_____to the window. A. lighted/walked B. lit/was walking C. was lighted/was walking D. lit/had walked Question 15 : "You_____here before?" "Yes, I_____my holidays here last year. A. Were/spent B. Have you been/spent C. Were/had spent D. Have you been/have spent Question 16 : "You have just missed the last train." "Never mind, I_____."A. will walk B. was walking C. am walking D. am going to walk Question 17 : I_____my sister in April as planned. A. have seen B. will see C. am going to see D. see Question 18 : Then about a year ago, he_____and I_____from him since. A. has disappeared/haven’t never heard B. has disappeared/never heard C. disappeared/ have never heard D. was disappeared/had never heard Question 19 : After the guests_____she went back into the living-room and _____off the light. A. left/switched B. had left/switched C. had left/had switched D. had left/was switching Question 20 : When Alice gets here, you_____her to her room? A. will you show B. did you show C. have you shown D. are you showing Question 21 : As Hugh and I_____down the steps we nearly_____into my father. A. came/ran B. were coming/ran C. had come/ran D. came/were running Question 22 : If you want to see us, come to Tom's on Sunday. We_____for you there at midday. A. will wait B. will be waiting C. will have waited D. will have been waiting Question 23 : Come in, please. I_____for you long. A. have waited B. had waited C. have been waiting D. waited Question 24 : For a moment after their son_____the room, Mr and Mrs Smith merely_____and_____at each other. A. had left/had stood/looked B. had left/stood/looked C. left/stood/looked D. had left/had stood/had looked Question 25 : When we_____in London tonight, it_____. A. arrived/was probably raining B. arrive/ will be probably raining C. arrived/had been probably raining D. arrive/ will have probably rained Question 26 : I'm afraid I must ask you both what_____yesterday at 10:20 p.m. A. did you do B. had you done C. you were doing D. were you doing Question 27 : There_____great changes in our village in the past few years. A. have been B. had been C. was D. has been Question 28 : The noise from the trains_____me terribly last night. A. was annoyed B. annoyed C. has annoyed D. had annoyed Question 29 : Listen to this! I think this news_____you. A. surprises B. will surprise C. surprised D. would surprise Question 30 : By the end of this month, I hope I_____200 pages of my new novel.A. had written B. will have written C. will have been writing D. have written