1) If you expose iron to oxygen, it _______. a) will rust b) rusts c) rust 2) If the internet connection fails, we _______ our work. a) lose b) lost  c) loose  3) If you apply pressure to ice, it _______ its melting point. a) lower b) lowers c) will lower 4) If you plant seeds in fertile soil, they _______. a) sproot b) sprouts c) sprowt 5) If a circuit is closed, the current _______. a) flows  b) flood c) flown 6) If you _______ the enzyme, the reaction rate increases. a) ad b) add c) attach 7) If sunlight reaches the chlorophyll in plants, photosynthesis _______. a) occur b) occurs c) occured 8) If you combine sodium and chlorine, you _______ salt. a) win b) recieve c) obtain 9) If the temperature of water drops below 0°C, it _______. a) melts b) freezes c) boils 10) If you conduct electricity through a copper wire, it _______ efficiently. a) provides b) get c) conducts 11) If a computer's CPU overheats, it _______  a) go under b) ceases production. c) goes on strike 12) If you don't provide adequate nutrients, the plant _____ a) perishes b) overflows  c) expires 13) If you apply a strong enough force, a material _______. a) broke b) disintegrate c) decays 14) If an ecosystem loses its keystone species, it _______ balance. a) loses  b) loose c) loss 15) If water vapor condenses, it _______ back to liquid form. a) vaporates b) inverts c) freezes 16) If you manipulate the variables correctly, the experiment _______ significant results. a) yields b) neglect  c) holds 17) If the financial market experiences a downturn, investors _______ confidence. a) lose b) loses c) loose 18) If you heat a gas, its molecules _______ faster. a) moved b) moves c) move 19) if you _______ an electric current, it produces a magnetic field. a) generate b) provide c) produce 20) If you place a solvent in a solution, it _______ the solute. a) disoolves b) disolves c) dissolves 

ZERO CONDITIONAL

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