A. walked
B. had walked
C. has been walking
D. had been walking

A. For
B. Since
C. at
D. by

A. who
B. whose
C. whom
D. which

A. By
B. with
C. through
D. From

A. Verb
B. Adjective
C. Noun
D. Preposition

A. at
B. to
C. on
D. for

A. Of 
B. By
C. With
D. From

A. noted
B. knew
C. noticed
D. none of these

A. Morgage
B. Morguage
C. Mortgage
D. Morgauge

A. Cessation
B. Cession
C. Session
D. cestion