III. Choose the best option to complete each sentence. 9. When we go out, my dad always carries the _________ bag of all. A. heavy B. heavier C. heaviest 10. I’m writing _________ poem. _________ poem is about 3Rs. A. a/ The B. a/ A C. an/ The 11. Fansipan Peak is ________ than Son Tra Mountain. A. more high B. higher C. highest 12. When you create new products from used materials, you are _________. A. recycling B. reducing C. reusing 13. My home robot can _________ clothes for me. A. plant B. water C. iron 14. When I have free time, I like to _________ the Internet. A. go B. surf C. play 15. In the future, robots can work as a _________ to keep our house safe. A. watch B. guard C. viewer 16. If you come to Vietnam, don’t forget to try its_________ street food. A. tasty B. easy C. helpful 17. Oh no, these are my pencils. _________ are over there! A. You B. Your C. Yours 18. Kate: How ___________ do you play computer games? - Nick: Two or three times a week. A. often B. many C. long