With a lot of difficult problems _______, the newly-elected president is having a hard time. 
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A
settled
B
setting
C
to settle
D
being settled
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This is the best way I have thought of __________ the problem.
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A
to be solved
B
solving
C
to solve
D
solves
The doctor did __________ save the patient’s life.
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A
that he could do
B
all what he could
C
all he could to
D
which he could