You'll be able to speak English well if you................ hard.
A.studied
B.study
C.had studied
D.studies

The ....................of cars, motorbikes and factories has also increased air pollution in most cities.
A.gas
B.dirt
C.dust
D.exhaust fume

Our ............. is all the air, water and land in which we live.
A.area
B.environment
C.place
D.region

.................is the process of making something dirty or impure.
A.Transformation
B.preparation
C.Pollution
D.Population

A lot of trees in .................are cut down, resulting in deforestation.
A.region
B.forests
C.wasteland
D.country

We have to ..............our environment to keep it from harm before it's too late.
A.protect
B.detect
C.respect
D.suspect

In some countries there are laws ................ littering and smoke.
A.forgetting
B.prohibiting
C.observing
D.destroying

Using electricity to catch fish is very dangerous. People may die from ...............shock.
A.electric
B.electronic
C.electricity
D.electrify

He looked ............... at the angry crowd.
A.calm
B.calmly
C.calmness
D.calmity

If it ......................to shine like this, the clothes will be dry in an hour.
A.continue
B.continued
C.continues
D.had continue