4. Read the following text and fill the gaps with correct form of verbs as per subject and context. Deforestation (a) - (mean) cutting down trees at random. It (b) - (cause) mainly by a group of dishonest people. They cut trees (c) - (make) profit. Ordinary people also (d) - (use) trees as fuel and furniture. Because of (e) - (cut) more and more trees, we are going (f)- (face) a great danger in the coming future. We (g)- (know) that oxygen (h) - (supply) by trees for animals. Without (i)- (take) oxygen, we cannot live a 1 single moment. If trees (j) - (cut) down in this way, the amount of carbon dioxide (k) - (increase) in the Latmosphere. As a result, the heat (1) - (rise). It (m) - (call) we must plant more and more trees. greenhouse effect. (n)