G8_U7

A number of cleaning products contain ______ chemicals

• safeful

• helpful

• harmful

• hopeful

The gases from the exhausts of cars have also increased ______ pollution in most cities.

• land

• sand

• water

• air

The death rate would ______ if hygienic conditions were improved.

• decrease

• increase

• be

• up

When radiation goes into the land, air or water, it is called radioactive ______.

• pollution

• polluted

• pollutants

• polluting

Too much use of electric lights in cities may ______ light pollution.

• go

• result

• cause

• lead

______ pollution is the contamination of lakes, rivers, oceans, or groundwater, usually by human activities

• Soil

• Air

• Noise

• Water

Land pollution happens when human activities ______ the Earth's surface.

• cover

• destroy

• damages

• cause

recycle (v)
/ˌriːˈsaɪkl/

• tái chế

• tái sử dụng

• tái tạo

oxygen (n)

/ˈɒksɪdʒən/

• H₂O

• CO₂

• O₂

release (v)

/rɪˈliːs/

• ngủ

• thải ra

• tăng lên