26. “I heard that Laura was offered a job at a top computer firm in Chicago.” ~ "Oh? That's wonderful! She ________very pleased.” A. is supposed to be B. might be C. must be D. is 27. "The hot weather doesn't seem to bother you." ~ " When I had my farm. I _____________work in the hot fields for hours.” A. used to B. ought to C. must D. had better 28. “They towed my car away from the executive parking lot yesterday." ~ "You _____________ have parked there." A. may not B. should not C. must not D. might not 29. “Are you going to have a big party for your father?" "Not this year, but next year. He ______________50 years old then.” A. should be B. must be C. will be D. has to be 30. “I need some help with this table._______ you lift the other end, please ?”~ "Sure, just a second.” A. May B. Should C. Could D. Shall 31. "Barbara just told me that she can't go to the meeting tonight.” ~ "She ______________go! We need her there for the financial report.” A. has got to B. has gotten to C. have to D. must be Giải thích nha ạ