18. Everyone is ready for the game, ________ ? A. is it B. Isn’t he C. aren’t they D. is there 19. Overcrowded places have a lot of problems,________ ? A. don’t they B. does it C. doesn’t it D. have they 20. People living in the slums never get good healthcare, ? A. do they B. don’t they C. are they D. aren’t they 12. The schoolyard is very small, so there isn’t enough ________ for students to play in. A. rooms B. land C. space D. ground