Read the passage and fill the suitable word in the blank

I. Read the passage and fill the suitable word in the blank:

        We are destroying the Earth. The seas and rivers are (1)................dirty to swim in. There is too (2).....................smoke in the air in many cities in the world. We are cutting (3)...................... too many trees. We (4) ...............burning the forests. We are also destroying (5).....................of plants and (6)......................Many areas (7)......................Earth are wasteland. Farmers in many parts of the world cannot (8)...................enough to eat. In some countries (9)................is too little rice. The Earth is in (10)........................ save the Earth!