Your answer would be:
US citizens are required to (options not shown). (Voting) is a privilege that only US citizens can exercise, but it is not required.
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The answer is option D: adverb.
<em>Sometimes </em>is an adverb of frequency, which indicates how often something happens. Adverbs of frequency are usually used for repeated or periodic activities, so they often go with the present simple tense. Other examples of adverbs of frequency are: <em>always</em>, <em>usually</em>, <em>often </em>and <em>never</em>.
The best answer would be C. inside because innards is the guts of an animal or human and where do guts rest? Inside an organism.
Upon discovering that I lied about going to my friend's house, my mom grounded me for three weeks, which I thought was excessive.
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