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___________for his good skill, this doctor has a lot of visitors calling for help all the time.
#48486
A
Knowing
B
To know
C
Known
D
To have known
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 It will be difficult for a robot       the same as humans.
#48768
A
do
B
to do
C
doing
D
does
Xu Qian loves        jokes .
#50848
A
tell
B
tells
C
in tell
D
to tell
Jim spent  half an hour ______his work.
#50083
A
finish
B
to finish doing
C
finishing to do
D
finishing
We shall  never give up ______ for even one day.
#49951
A
studying
B
study
C
to study
D
studies
Timmy is worrying about       enough time       the work.
#50396
A
not to have; doing
B
not having; doing
C
not to have; to do
D
not having; to do