1 ____ an experiment 2 ____ research 3 ____ a hypothesis and ____ it 4 ____ a substance in water and heat it up to help it dissolve 5 ____ a chemical reaction that ____ a gas 6 ____ students' progress 7 ____ the results of an experiment and ____ them 8 ____ a report and ____ references at the end 9 ____ something under a microscope 10 ____ hard work 11 ____ a chemical 12 ____ an assignment

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