选出你所听到的句子。 (     )1. A. Do you know who invented the computer? B. Do you know who invented the calculator? C. Do you know who invented the TV set? (     )2. A. The computer is an important invention in our life. B. The computer is a useful invention in our life. C. The computer is a helpful invention in our life. (     )3. A. By the time I got outside, the bus had gone. B. By the time I got inside, the bus had gone. C. By the time I worked outside, the bus had gone. (     )4. A. I think the plane makes our life convenient. B. I think the telephone makes our life convenient. C. I think the telephone makes our life comfortable. (     )5. A. I have never been late for school. B. I am late for school sometimes. C. I was late for school yesterday.