After her son died in a car accident, the old lady would sit at the window, ______ out and _______ in thought.    
#97224
A
looked; lost
B
looking; losing
C
looked; losing
D
looking; lost
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Food safety is one of the problems      now all over the world.
#91716
A
discussed
B
to be discussed
C
being discussed
D
having been discussed
The young man came _______ to the airport hurriedly only_______his girl friend had already gone.
#88658
A
driving; to find
B
to drive; to find
C
and drove; found
D
driving; finding