6.The speaker‘s forceful words persuaded his opponent to _______.
A. back out
B. back up
C. back on
D. back down
7.It was important for the president to continue his schedule， regardless _______ the bomb threat.
A. of
B. by
C. from
D. with
8.The Atlantic Ocean is one of the oceans that separate the old world _______ the new.
A. in
B. away
C. to
D. from
9.Health _______ good food， fresh air and enough sleep.
A. rely
B. depend
C. depends on
D. consist of
10.A plan was made last year ______ several roads would be built in this part of the city.
A. as
B. where
C. which
D. that