After the old soldier returned home, he never referred________hismiserable memory in prison.
A. to
B. with
C. upon
D. down
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You are welcome to ________by at any time.
A. pass
B. drop
C. take
D. get
The two countries have to carry _______with the negotiation next week.
A. on
B. out
C. up
D. into
Witnesses backed________from the bloody scene of the accident.
A. off
B. away
C. into
D. upon
Many great linguists have ________ most of their time and energy to the scientific study of language.
A. spent
B. saved
C. devoted
D. cost