IF HE HAD REALIZED THE TRAFFIC LIGHTS WERE RED, HE (STOP)………... ĐỌ...

15. If he had realized the traffic lights were red, he (stop)………..

. Đọc kỹ dọan văn sau đây và chọn câu trả lời đúng A, B, C hoặc D để điền vào chỗ trống.

Air pollution occurs when wastes dirty the air. People produce most of the(1)………..that cause air

pollution. Such wastes can be in the form of gases or particles of solid or(2)………matter. These

substances result chiefly form burning(3)……….to power motor vehicles and to heat buildings. Industrial

processes and the(4)………..of garbage also contribute to air pollution, Natural pollutants (impurities)

include dust, pollen, soil particles and(5) ………..occurring gases.

The rapid growth of population and (6) ……….. and the increasing use of automobiles and

airplanes have made air pollution a (7)……… problem. The air we breathe has become so filled with

pollutants that it can cause (8)……….problems. Polluted air also(9)……….. plants, animals,

building materials and fabrics, In addition, it causes (10)……….by altering the altering the earth’s

atmosphere.