question: What sentence would provide a factual answer to this question: "Sound can travel through the"

answer: sound can travel through air

question: What sentence would provide a factual answer to this question: "Which three events are likely to occur once per day?"

answer: cycles of day and night occur once per day

question: What sentence would provide a factual answer to this question: "to determine how firm a certain mineral may be a person can:"

answer:
quartz scratches glass easily