Read the following text and use modifiers as directed in the blank spaces:

Trees, (a) ______ (use an apositive), are essential for maintaining eco-system. Without trees, the balance of eco-system will be (b) ______ (post modify the verb) lost. Trees provide us with (c) _____ (pre-modify the noun) elements without which we cannot live on this earth. It is a matter of (d) ______ (pre-modify the noun) concern that we are felling trees (e) ______ (post modify the verb). As a dire consequence, the global temperature is rising (f) ______ (post modify the verb). The existence of flora and fauna is at an (g) ________ (use a pre-modifier) risk. Polar ice caps are melting and (h) ______ (use a noun adjective) level is rising. (i) ______ (use a present participle phrase), we can avoid such a catastrophe. If we want to keep our (j) _______ (use a noun adjective) earth safe and sound, we have to plant trees and protect our forests.