1. 150 million kilometres/ Earth/ sun
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2. 105 km/ Hanoi/ Hai Phong.
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3. 500 metres/ my house/ my school
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4. 170 km/ Quy Nhon City/ Pleiku City
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5. not very far/ here/ Tan Son Nhat Airport
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EX2.
1. She________ as a teacher for many years before she became a writer
a. didn't use to work b. used to worked c. used to work d. worked
2. There______ a bus station there. When was it built?
a. used to be b. usedn't to be c. didn't use to be d. used not being
3. Dominic _________ to bed late on Fridays and Saturdays.
a. usually goes b. uses to go c. doesn't use to go d. is used to go
4. What kind of music ________when she was a child?
a. Nancy used to like b. used Nancy to like
c. did Nancy used to like d. did Nancy use to like
5. He _______several books a month, but he doesn't have time any more.
a. usually reads b. used to read c. used to reading d. didn't use to read