6. After working on computers for long hours, you should ……… your eyes and relax. A. sleep B. sleep in C. wake D. rest 7. Rob eats a lot of fast food and he ……… on a lot of weight. A. takes B. puts C. spends D. brings 8. We need to spend less time ……… computer games. A. play B. to play C. playing D. to playing 9. The first working product that uses a design is called a ………. A. method B. technology C. redesign D. prototype 10. To ……… healthy, you need between 1,600 and 2,500 calories. A. let B. stay C. make D. do 11. I ate too much seafood, so I had a/an ……… yesterday. A. earache B. backache C. stomachache D. headache 12. Laughing is very good ………. your health. A. for B. of C. at D. to 13. When you have a fever, you should drink more water, stay in bed and relax ………. A. much B. more C. most D. less 14. After you test a prototype, you communicate information to other people. This information is called ……… A. hypothesis B. the results C. a story D. an investigation 15. The doctor advised him to play more sports and ……… computer games. A. more B. little C. less D. least