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launching the gas from rockets. releasing the gas from a big chirmley. producing the gas from volcanoes. spraying the gas from high-altitude planes.
collect handle analyze investigate
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began had begun were beginning have begun
a. build up put up make up clear up
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providing;for supplying;for offering;with providing;with
exactly extremely generally gradually
build up put up make up clear up
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to solve to be solved solved be solving
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