Write complete sentences using the guided words and phrases. Add or make any changes if necessary

Ex1: write complete sentences using the guided words and phrases. Add or make any changes if necessary 
4.these/sources/available/everywhere/the world/so/it/easy/produce/biomass energy
5.in this way/you/reduce/landfill/and/turn/waste/energy
6.moreover/biogas energy/cheap/and/cost/much less/coal/or oil
7.you/can spend/less/light/or heat/your house/by/use biomass