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(a) indeed
(b) that/which
(c) that
(d) If
(e) and
Trees are very important (a) indeed They produce oxygen (b) that/which is a must for man and all living beings. We must realize (c) that they help us in many ways. (d) If trees are less in number, there will be an increased amount of carbon di-oxide in the atmosphere (e) and it will enhance greenhouse effect.
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