1. ...............habitats have been destroyed in recent years. (nature) Đây là một câu hỏi bắt buộc 2. A number of cleaning products contain ............. chemicals. (harm) harmful 3. Water samples collected at these villages were seriously......................with bacteria. (contaminate) 4. ...................... waste spills can contaminate groundwater. (industry) 5. In many developing countries, water pollution is a leading cause of .................. (die)