6. What made the change in materials harmful to the environment?
A. If it is not utilized properly.
B. If the material can pollute the land, air and water.
C. If the waste material changes is not dispose properly.
D. All of the above
7. Which of the activities do not prevent/minimize the harmful effects of the
changes of the materials to the environment?
A. buy a lunchbox for everyday use.
B. collect and recycle plastic bottles and cans.
C. use washable plates instead of plastic cups, plates and spoons.
D. buy and use plastic cups, plates, spoons everyday for use at home.

useless answer = report