In the following passage, some words have been deleted. Select the most appropriate option to fill in each blank. 

Pollution is destroying nature. The smoke that is (1) _______ from the chimneys of the factories, and from vehicles is the mixture of poisonous gases. Due to environmental pollution, there is (2) _______ in nature, so, many birds, animals, and plants are on the verge of (3) _______ day by day. The only way to (4) _______ environmental pollution is to plant many trees. By planting trees, we can get rid of many harmful poisonous gases. It is the responsibility of everyone to (5) ______ and protect our environment.