1. It is a useful change in materials to one's environment. A. Burning of old tire. B. Throwing of garbage in the canal. C. Cutting of trees. D. Cutting of fabric to be made into clothes. 2. It is a harmful change in materials to one's environment. A. Cutting of fabric to be made into clothes. B. Burning of garbage. C. Plastic bottle can used as flowerpots. D. Old tire can used as chair or plant pots. 3. If you are going to dispose waste materials commonly found at home, what are you going to do with the decaying materials A. make a compost B. mix them with the non-decaying C. throw them in the river D. keep them in the cabinet and use them again 4. Using of egg trays for growing plants is what kind of SR's. A. Reuse B. Reduce C. Recycle D. Rot 5. Fixing of clothes is what kind of SR's A. Reuse B. Repair C. Recycle D. Rot 6. Using of eco bag when going for groceries is what kind of SR's A. Reuse B. Repair C.Recycle D. Reduce 7. Making of compost pit is what kind of SR's A. Reuse B. Rot C. Recycle D. Reduce​