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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Answer:
opening and cavern
Explanation:
Both have meanings similar to grotto
Answer:
Make sure to add the worksheet or document with the question so we can asnwer it properly!
Explanation:
Cats make good house pets. It's the main idea in the sentence, and it's independent also. The other clause is dependent, so it is not the main clause.