Trees are (a) — to man in many ways. They provide us (b) — oxygen without which we cannot live more than a few minutes. They supply (c) — with vitamin and food, give us shade and help to (d) — drought and flood. Unfortunately, we cannot realize (e) — importance of trees. We cut them (f) — in large numbers. (g) — it is a suicidal attempt. (h) — we do not stop (i) — acts, soon our country will , no doubt , turn (j) — a desert.