question: What sentence would provide a factual answer to this question: "A person wants to conduct thermal energy through his house, so when deciding on construction materials, he chooses"

answer: a thermal conductor is made of materials that conduct thermal energy

question: What sentence would provide a factual answer to this question: "the mass of a planet causes"

answer: the mass of a planet causes the pull of gravity on that planet

question: What sentence would provide a factual answer to this question: "A pulley is used to lift a flag on a flagpole by"

answer:
a pulley is used for lifting objects