Bài 2 : Match the definition with the suitable noun. 1. When you use something again. a. Recycle 2. When you use something less than usual. b. Air pollution 3. When you make new products from used materials. c. Reuse 4. When people say something aloud. d. Recycling bins 5. When air is polluted. e. Noise 6. Containers for things that can be recycle. f. Reduce 1. ...................... 2. ...................... 3. ...................... 4. ...................... 5. ...................... 6. ......................