9. Working hard and doing a lot of exercise helps you burn the calories easily. A. more B. less C. most D. the most 10. About one-fifth of the American population volunteer work each year. A. do B. does C. make D. makes 11. Don’t read or study when there is not enough light because it is to your eyes. A. harm B. harmful C. harmless D. unharmed 12. He had a cold he didn’t wear warm clothes in the cold weather. A. and B. or C. because D. although 13. There a bus station in the city centre, but it has been moved to the suburbs. A. used to be B. used to have C. use to have D. were 14. I marbles when I was young, but now I didn’t. A. play B. used to play C. have played D. didn’t use to play 15. “ is it from your house to the nearest bus stop?” - “About 50 meters’ A. How far B. How long C. How often D. How much