11. Recycling programs have helped to solve some of the ............. problems. (environment)
12. These plants grow well in ............ soil by the river. (fertilizer)
13. The silence and ............ of the house made the children feel frightened. (empty)
14. Farmer use different kinds of ............ to enrich the soil. (fertilize)
15. Companies are encouraging people to buy more by ............. the prices oftheir products. (reduce)
16. The money should be more ........... spent on the recycling plan. (use)
11. Recycling programs have helped to solve some of the environmental problems. (environment)
12. These plants grow well in fertile soil by the river. (fertilizer)
13. The silence and emptiness of the house made the children feel frightened. (empty)
14. Farmer use different kinds of fertilizer to enrich the soil. (fertilize)
15. Companies are encouraging people to buy more by reducing the prices oftheir products. (reduce)
16. The money should be more used spent on the recycling plan. (use)