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doping – n. the illegal use of a drug (such as a steroid) to improve an athlete's performance
monitor – v. to watch, observe, listen to, or check (something) for a special purpose over a period of time
sponsor – n. a person or organization that pays the cost of an activity or event (such as a radio or television program, sports event, concert, etc.) in return for the right to advertise during the activity or event
