Richard was called in by the police to answer questions _______ the disappearance of Thomas Ripley, whose relatives were so ______ his present situation.
#4655
A
concerning; concerned about
B
concerned; worrying about
C
with regards to; concerned
D
regarding; concerning about
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.The horses________each other________the first prize in the match. 
#4781
A
competed against; for
B
competed against; to
C
completed against; for
D
completed; to get
—Would you like to come on Friday or Saturday? —______
#4709
A
Yes, of course.
B
Another is better.
C
What’s the matter?
D
Either is OK.