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protect to protect protecting protected
to protect; being polluted to protect; polluting to protecting; being polluted to protecting; polluted
will we protect the earth we can reduce pollution should we save water we must recycle things
protect to protect protecting protected
damage destroy threat protect
protecting; better protecting; the best to protect; better to protect; the best
to protect; being polluted to protecting; being polluted to protect; polluting to protecting; polluted
should we we should it we should it is we should
Our living space on the earth is getting smaller and smaller Our living space should be measured in cubic volume We need to take some measures to protect space We must create better living conditions for both birds and animals
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