Chọn đáp án đúng 1. It's time you____ harder for the next exam A.work. B.are working. C.worked. D.have worked 2. Jim doesn't speak very clearly. A.it's diffcult to understand him. B. it's diffcult for understanding him. C. He's diffcult in understand him D. It's diffcult to understand 3. Only when she apologizes_____ to her again A. I'll speak. B. Will I speak. C. That I speak. D. I speak 4. Let's go ahead and do it now. Nothing____ by waiting A.accomplishes. B.accomplished. C.has accomplished. D.will be accomplished 5. At the end of this month, we____ friends for tên years A. Will be. B.are. C.has been. D.will have been 6. If we leave now for our trip, we can drive half the distance before we stop___ lunch A.having. B.to have. C.having had. D.for having