We need to ________ the environment by recycling.
save the environment
?
deep
?
boiling
?
understand
?
wind
?
hot
?
protect
?
cut down trees
Solar power can ________ electricity for our homes.
provide
________ is energy from the heat inside the Earth.
geothermal energy
?
underground
?
destroy
?
heat
The lamp can ________ the room at night.
light
?
rainforest