Câu 20: I have been waiting for you A. since early morning B. since 9 a.m C. for two hours D. All are correct Câu 21: Almost everyone for home by the time we arrived. A. leave B. left C. leaves D. had left Câu 22: By the age of 25, he two famous novels. A. wrote B. writes C. has written D. had written Câu 23: When her husband was in the army, Mary to him twice a week A. was reading B. wrote C. was written D. had written Câu 24: I couldn't cut the grass because the lawn mower a few days previously. A. broke down B. has been broken C. had broken down D. breaks down Câu 25: I have never played badminton before. This is the first time I ____ to play. A. try B. tried C. have tried D. am trying Cảm ơn nhiều ạ.