Câu 6: By the end of this year my father, _______ in this company for 12 years. A. has worked B. will have been working C. will work D. has been working Câu 7: I would have saved myself a lot of time over the years _______ then what I know today. A. only had I known B. I had known C. If I knew D. had I known Câu 8: The more we learn, _______. A. the wiser we become B. we become wiser C. we become wise D. wiser we become Câu 9: I will back you up in whatever you do. A. sue you B. disturb you C. support you D. help you Câu 10: ____________ in 1636, Harvard is one of the most famous universities in the United State. A. Being founded B. Founding C. It was founded D. Founded Câu 11: “I heard your grandfather _______ at someone this morning.” - They are our neighbors’ children. He doesn’t allow _______ the garden to prevent the fruits from _______.”