conductor, A material that lets electricity or heat pass through easily., soluble, Able to dissolve in a liquid., deadline, The latest time by which something must be done., thermal, Relating to heat., determine, To figure out or decide something by thinking., insulator, A material that does not let electricity or heat pass through easily., postpone, To delay something to a later time or date., dissolve, To mix into a liquid and become part of it., caffeine, A chemical in some drinks (like coffee and tea) that can wake you up., limousine, A long, fancy car often used by important people., substance, A kind of matter with a definite composition., adrenaline, A chemical in the body that gives a quick energy boost in exciting or scary situations..

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