10045 - Part D (Page 165) Test:8 - Water, ________ , is also one of the most abundant compounds on earth.

Water, ________ , is also one of the most abundant compounds on
earth.
it is necessary for human survival
for human survival
is necessary for human survival
one of the most critical elements for human survival
English Modals Tests
Elementary Grammar Exercises A1
Table of English Grammar Contents (All Levels)
Pre-Intermediate Grammar Exercises