A. of B. off 17. People should stop using so A. more B. less C. on energy. C. many D. up to reduce pollution. D. much 18. Planting more A. does B. flowers C. trees 19. means giving things to people in need. A. Swap B. Charity C. Reuse D. Recycle 20. If we plant more trees inthe schoolyard, the school will become a _________________place. A.greener B. darker C. dirtier D. grass place. D.more polluted blu brow
