This passage has a melancholic mood. You can tell this due to some specific key words: "dull", "dark", "soundless." They all have a negative connotation. The imagery of a lone rider in a dreary and dull country under the oppressive sky may clue you in that the overall passage has a sad tone to it. Even later in the passage the author states that the scene is melancholic.
Answer:
because it's important for them to have an understanding of most things
Explanation:
which is why we require educators to be not just high school graduates but university graduates as well.
The astronomical debris was pulled into an orbit around the star.
Too busy for her own good, Sarah was negligent about drinking enough water.
The other verb phrases would not fit the context of the sentence.
