A. Mark Twain
B. Mark Twain's
C. that of Mark Twain
D. those Mark Twain wrote
A. If you were to turn off
B. Turn off
C. Turning off
D. Having turned off
A. Literal
B. Illiterate
C. Literate
D. Literary
A. off; at
B. down; at
C. less; for
D. lower; on