People________ the beach with rubbish. (RUN or POLLUTE?)
pollute
Have you ever seen a __________ of Earth? (SATELLITE PHOTOGRAPH or SURFACE?)
satellite photograph
Let´s __________ that chair; it´s broken. (STICK TO or THROW OUT?)
throw out
Swimming in polluted water can be __________ (CLEAR or HARMFUL?)
harmful
Nowadays, __________ is often produced by solar energy. (ELECTRICITY or SATELLITE PHOTOGRAPH?)
electricity
The stamp didn´t ______________ the envelope and it came off. (POLLUTE or STICK TO?)
stick to
A strong wind can _____________ trees to fall down. (THROW OUT or CAUSE?)
cause
The water in the lake was so _________ that you could even see fish swimming. ( HARMFUL or CLEAR?)
clear
How long can you stay underwater withour coming up to the (SURFACE or ELECTRICITY?
surface
Most cars __________ on petrol. ( CAUSE or RUN?)
run
