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Each participant can be very proud of _____ accomplishments.

A. him or her

B. his or her

C. their

D. your

Read this sentence: Thomas Edison invented or improved over a thousand things, some of which we use every day. What does invented mean?

A. using scientific knowledge or tools to do something

B. created, designed, or built something that did not exist before

C. set up or done to make money

D. made a drawing of something