HE WAS VERY TIRED,……….HE TOOK A REST BEFORE CONTINUING THE WORK.A....

25. He was very tired,……….he took a rest before continuing the work.

A. and

B. but

C. if

D. so

III. Đọc kỹ đoạn văn sau rồi chọn phương án (A, B, C hoặc D) để hoàn thành các câu từ 26 đến 30.

Air pollution happens when wastes dirty the air. People reduce most of the wastes that cause air

pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result

chiefly from burning fuel to power motor vehicles and to heating buildings. Industrial processes and the

burning of garbage also contribute to air pollution. Besides, there are other substances that naturally exist in the

air. They include dust, pollen, soil particles, and naturally occurring gases.

The rapid growth of population and industry and the increasing use of automobiles and airplanes have

made air pollutionn a serious problem. The air we breathe has become so filled with pollutants that can cause

health problems.

It

also harms plants, animals, building materials, and fabrics.