P................ is something which makes our environment dirty.
pollution
A big shop with many little shops is called a d........... s.......... .
department store
Something very big is h.......
huge
E.......... f...... are smoke which comes from the engine of a car.
exhaust fumes
Most birds build n......... to live in.
nests
You put rubbish in a d...........
dustbin
A.............. c.............. is a machine that keeps us cool in the summer.
air conditioner
Many wild animals are threatened with e............ .
extinction
Dirty water that pollutes rivers is called s...... .
sewage
The Amazon rainforest produces 20% of the world o......... .
oxygen
