a person who leads and controls, 1. commander, a gas with no smell or color, a large part of the air on earth, and needed by animals and plants to live, 2. oxygen, a material used to provide heat or power, usually by being burned, 3. fuel, a flat surface on a television or computer on which pictures or words are shown, 4. screen, a machine that uses energy from fuel or steam to produce movement, 5. engine, to move air into and out of the lungs, 6. breathe, the answer to a problem, 7. solution, something known by only a few people; kept hidden from others, 8. secret, a vehicle used for travel in space, 9. spacecraft, an amount of something, expressed as a number out of 100, 10. percentage, someone who visits a place for pleasure and interest, usually while on holiday, 11. tourist, a detailed study of a subject to discover new information or reach understanding, 12. research, a machine, usually with wheels and an engine, used for transporting people or goods, 13. vehicle, to use too much of something or use it badly when there is a limited amount, 14. waste, one more person or thing, or an extra amount, 15. another.

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