He seems not to _____ energy, so he can work for hours without stopping.
run away
run out of
run up
Strawberries are _____ and cheap in summer.
renewable
plentiful
limited
Our _____ natural resources will run out soon.
available
nuclear
harmful
Using green sources of energy can make the air ____.
unlimited
cheap
clean
Solar energy seems to be _____ - we can rely on it for a very long time.
limited
unlimited
harmful
The air becomes worse because of _____ gases from that factory.
pollution
polluted
polluting
pollutants
We should rely much more on ______ sources of energy.
expensive
alternative
limited
The river provides a ______ supply of clean water to nearby villages - they don't worry about water supply any more.
plentiful
polluting
limited
The problem with fossil fuels is that they are not _______.
dangerous
renewable
non-renewable
The public has more concerns about _____ energy because of danger.
solar
water
nuclear
Solar energy can be changed into ____.
electrician
electricity
electric
Nuclear power is expensive and _____ (DANGER)
dangerous
The movement of waves and tides can generate ______ (electric).
electricity
