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Mr. Smith gradually _____ a knowledge of the subject.

A. attained     B. achieved         C. required            D. acquired

Mr. Smith gradually _____ a knowledge of the subject.

A. attained    B. achieved    C. required    D. acquired

Mr. Smith gradually _____ a knowledge of the subject.

   A. attained    B. achieved    C. required    D. acquired

22. Mr. Smith gradually _____ a knowledge of the subject.

        A. attained                    B. achieved                    C. required            D. acquired

Mr. Smith gradually _____ a knowledge of the subject.

        A. attained                    B. achieved                    C. required            D. acquired