Câu 21. All our English teachers are . . . . . speakers. A. native B. original C. foreign D. orginally Câu 22. If you were the president, what . . . . . you do to help the environment ? A. will B. would C. do D. are Câu 23. When she comes later today, he . . . . . the dinner. A. cooks B. is cooking C. will be working D. has cooked Câu 24. If the teacher were here now, wed ask him the difference . . . . science and technology. A. among B. of C. between D. for Câu 25. Our teacher says that new technology . . . . . many worker jobless in the future. A. makes B. is making C. will make D. has made