11. The lighting fixture is A. on 12. Children B. above the dinner table. C under play with a knife. It is dangerous. Coughtn't to A. mustn't 13. What does the sign mean? A. People can smoke here B. don't have to B. Smoking is unsafe. C. No one is allowed to smoke here D. Smoking causes cancer 14. What does the sign mean? A. B. C. D. You musn't throw garbage here Everyone can litter Put the dustbin around your house. Keep the air cleaner D. beneath D. cannot