Tom finished school when he was eighteen yearsold. He wanted to work at a bank in the city. He wentto the bank and asked for work there. A man took himinto a small room and gave him some questions on apiece of paper. Tom wrote the answers on the paper in ahurry. The man looked for a few minutes, and then said, “Is your birthday on the 12th of December, Tom?” “Yes, sir.” Tom said. “What year?” The man asked. “Oh, once a year(一年一次), sir.” Tom said.
1. How old was Tom when he finished school? ( )