question: What sentence would provide a factual answer to this question: "the solstice with the longest day happens in the month after"

answer: the summer solstice is on June 21st in the northern hemisphere

question: What sentence would provide a factual answer to this question: "What stores food for future use and is green?"

answer: usually plants store the food they produce for future use

question: What sentence would provide a factual answer to this question: "If sound is moving around in a room, the room is lacking in"

answer:
air is a vehicle for sound