1.They built the school in 1990. * a. The school was being built in 1990. b. The school was built in 1990. c. The school was building in 1990. d. The school which was built in 1990. 2.He used to travel around the country * a. He liked travelling around the country. b. He no longer travels around the country. c. He is used to travelling around the country. d. He never travelled around the country. 3.The last time I went to the museum was a year ago. A. I have not been to the museum for a year. B. A year ago, I often went to the museum. C. My going to the museum lasted a year. D. At last I went to the museum after a year 4The police started investigating the case a week ago. A. The police have investigated the case for a week. B. The police has investigated the case for a week. C. The police have investigated the case since a week. D The police has investigated the case for a week. 5.I would prefer you not to smoke in here. * A. I'd rather you didn't smoke in here. B. I'd rather you shouldn't smoke in here. C. I'd rather you not to smoke in here. D. I'd rather you don't smoke in here. Thì hiện tại hoàn thành , thì quá khứ đơn