Many methods for ______ of uranium have been proposed., detect, detecting, detection, detector, The process oxygen takes part in is known as ______., oxidation, oxidizing, oxidize, oxidized, In making ______, extreme care is necessary., observe, observations, observer, observed, The continuous ______ (absorb) and ______ (evolve) of carbon dioxide by plants is sometimes referred to as the carbon cycle., absorb, evolve, absorbing, evolving, absorbed, evolved, absorption, evolution, If water is poured into sulphuric acid much heat is given off, and the reaction may be followed by an ______ (explode)., explode, exploding, exploded, explosion

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