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－Have you seen Mr. Black these days, Jack?－Yes, I met him when I ________ in the street yesterday.
#49575
A
walked
B
was walking
C
have walked
D
is walking
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My father gave up ________ at last.
#49164
A
smoke
B
smoking
C
to smoke
D
Smokes
－Last semester, he had a hard time______ English.
#50462
A
learns
B
learning
C
to learn
D
learnt
Could you please ________ such a thing again?
#50730
A
not to do
B
don’t do
C
not doing
D
not do
People will live ____________ 200 years old in the future.
#49596
A
/
B
be
C
to be
D
in
--Thanks a lot for ________me with my English. -- You are welcome.
#49999
A
help
B
helps
C
helping
D
helped