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Many things                   impossible in the past are very common today.    

A. consider            B. considering           C. considered            D. be considered

Many things ____impossible in the past are very common today.

A. consider　 　 B. considering 　    C. considered　      D. be considered

Many things _______ impossible in the past are very common today.

　A. consider　              B. considering 　          C. considered　　         D. be considered

Many things _______ impossible in the past are very common today.

　A. consider　              B. considering 　          C. considered　　         D. be considered

Many things ____ impossible in the past are very common today.
　 A. consider　 B. considering 　 C. considered　 D. be considered