A. There should be an apostrophe on the it's, because it is saying, "only some of it is clean and safe enough to drink." The apostrophe should be on that word because it breaks the word down into it is, which is correct in the sentence.
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to question number 1 it's D and for question number 2 it is also D.
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Well for one it's just a photo and It's hard to find the meaning with just a photo but the photo is also an advantage because it will have a deeper meaning than anything you could read since its a literal example. You'll just have to think deep enough to find the meaning
Gregor hates his job for numerous reasons: he dislikes traveling every day to work, he dislikes the job itself, the inferior meals, the ever changing faces... But he has to continue working because his parents owe Gregor's boss money.
hope this helps....
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l don't really understand what you are saying, but yes pressure is not good