----- Nội dung dịch tự động từ ảnh ----- 17. Sam....to change a light bulb when he.................and.... A. was trying-slipped- fell C. had been trying- slipped- was falling 18. Every day I A. get-eat- leave C. got-ate-left B. tried- was slipping- falling D. has tried- slips- falls breakfast at seven o'clock and up at 6 o'clock, B. have got-eating- leaving D. will get-have eaten-left for work at 8 o'clock 19. ............................ for this company for more then thirty years, and I intend to stay here until I...............next year 6