Bob is very smart.He studies all the time .He is i________.

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Bobisverysmart.Hestudiesallthetime.Heisi________.Bobisverysmart.Hestudiesallthetime.Heisi________.Bo

Bob is very smart.He studies all the time .He is i________.
Bob is very smart.He studies all the time .He is i________.

Bob is very smart.He studies all the time .He is i________.
industrious
勤奋的