(2014·东北三校模拟)________about the student,the teacher called his parents to find out why he was so often absent from class.
#88443
A
Concerning
B
Concern
C
Concerned 
D
To concern
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(2013·青岛一模)All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.
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A
to be cancelled
B
were cancelled
C
have been cancelled
D
having been cancelled
These robbers are sure __________.
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A
to punish
B
to be punishing
C
being punished
D
to be punished
        writing the article, Mrs. Curie even forgot her dinner. 
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A
Absorbed in
B
Absorbing at
C
Having absorbed by
D
To absorb in