Answer:
am reading
Explanation:
Progressive tense means it is currently happening so the correct form is I am reading a really exciting book.
<span>D. Writers vary sentence structure and length, depending on the purpose of a piece</span>
Well some of them are probably real life ones like, <span>climate change, pollution, </span>environmental<span> degradation, and resource depletion etc.</span>
The invasion was frightening and humiliating for the Belgians.