Помогите с дз по английскому. ПРОШУ!!!

Прочитайте текст и вставьте вместо каждого пропуска нужную грамма- тическую форму, выбрав её из трёх предложенных вариантов.
Ecological awareness is very important today since we live on a A______________ planet. People all over the world discuss environmental protection, but we still continue to pollute air, water and soil.
nature
Plants and factories dump waste into rivers and lakes. This kills animals, insects and plants. There are organisations created B___________________ from pollution. The most famous one is Greenpeace. There are also special farms and nature reserves that help wild animals survive.
One of the C________________types of pollution is air pollution. Air pollution
is often caused by plants and means of transport in big cities. Large cities are oftenfull of smog because of heavy traffic. Cars, buses and planes are among the worst air polluters. Factories and plants also pollute air by pouring harmful gases and smoke into the air. D____________ causes lung diseases among people and does harm to our health. Acid rains that appear because of air pollution damage forests and soil.
Варианты ответов:
A. 1) polluted 2) polluting 3) pollute
B. 1) to protect 2) protect 3) protecting
C. 1) bad 2) worse 3)worst
D. 1) That 2) These 3) This