5．11．A．It's a blue bike． B．It's a green bike． C．It's a green toy train． 12．A．His mother． B．His father． C．He bought it for himself． 13．A．For five years． B．Since he was five． C．For four years． 14．A．Because it gave him sweet memories． B．Because he learned how to ride a bike on it． C．Because he went to school on it． 15．A．Old． B．Special． C．Common．
10．51．Tom works at an animal hospital everySaturday． 52．Tom wants to bean animal doctor in the future． 53．Tina reads books for children in the libraryafter school． 54．Tina reads books in the libraryonce a week． 55．They plan towork in an old people's home this summer vacation．
17．15．The smallest post office in the USA has only one room with no clerks． 16．The post offices in the USA are usually open from 8：30to 4：30on weekdays． 17．The United States Postal Service is the largest company in the world． 18．There are more than 40，000 post offices throughout the United States． 19．The post offices in the United States deal with more mails than those in Japan． 20．The passage mainly tells about the history of the post office in the United States．
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