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(a) because

(b) which

(c) but

(d) when

(e) So/Therefore

We know that trees are very important (a)because they produce oxygen (b)which is a must for all living creatures. They are our best friends (c)but we are not conscious of it. Time is coming (d)when there will be no tree left for us. (e)So/Therefore, we should plant more and more trees for our own sake.


 

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