The correct answer is:
Be determined
The Casket was an American magazine offering "flowers of literature, wit, and sentiment", published in Philadelphia in the early 19th century. he name of the magazine varied somewhat over time, with some issues and volumes titled "Atkinson's Casket", after the magazine's publisher.
<em>"Mr. Gascoigne's mind seemed to run on political topics, but whether relating to the past, present, or future, could not easily be determined"</em>
It is whom. You can only use who if you can replace is with he or she.
<span>for example, forests help the environment by soaking up carbon dioxide, conserving soil, and preventing flooding.</span>
