Яз 20 look, think and complete the text with your own ideas using these words and word combinations: useful, colourful, fresh air, clean, oxygen, to give, to cut down, should/ shouldn’t, protect, to help, to plant, to lose homes, bush, bushy, etc. plants are good and useful for our life. they make our world colourful. trees are oxygen boxes for us. they clean the air and give us fresh air to breathe. we should plant a lot of trees.