1) If something becomes ________by dirt, chemicals, or radiation, it becomes impure or harmful. a) expedition b) immortal c) incentive d) contaminated 2) An ________ is something that encourages you to do something. a) expedition b) immortal c) incentive d) contaminated 3) Someone or something that is ________ is famous and likely to be remembered for a long time. a) expedition b) immortal c) incentive d) contaminated 4) An ________ is an organized journey made for a particular purpose, such as exploration. a) expedition b) immortal c) incentive d) contaminated

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