______ that this was no ordinary fish, the fisherman made effort not to damage it.
A. To realize
B. Realizing
C. Realized
D. Realize
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______, she was able to communicate with French people.
A. Known French
B. Not to know French
C. Knowing not French
D. Although not knowing French
They stood ______ while the man was robbed.
A. looked at
B. looking on
C. looked on
D. looking at
The man_________there is my brother.
A. sit
B. be sit
C. sitting
D. seat
Librarians spend a lot of time ______ books.
A. classify
B. class
C. classifying
D. arrange