16. I’ll come and see you before I _______ for the States. A. leave B. will leave C. have left D. shall leave 17. S
16. I’ll come and see you before I _______ for the States. A. leave B. will leave C. have left D. shall leave 17. Sam…………..to change a light bulb when he…………….and………………down. A. was trying-slipped- fell B. tried- was slipping- falling C. had been trying- slipped- was falling D. has tried- slips- falls 18. I couldn’t … Đọc tiếp