植树与环保相关词汇 — 英语填空题
题目
根据句意和中文提示，写出本单元所学单词的正确形式补全句子。1. We should ___ (种植) more trees on the hill to make it green. 2. Don't ___ (砍) down the old trees in the park. 3. Trees can keep the ___ (空气) clean and cool. 4. Planting trees is good for our ___ (环境).