The world’s population is getting larger and larger, so scientists will have to ______ new ways to solve food problem.
#62812
A
catch up with
B
keep up with
C
come up with
D
make up with
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— It’s raining heavily outside. — Indeed. I prefer ________ at home ________ on such a day. 
#53812
A
stay; to go out
B
to stay; go out
C
staying; to going out
D
staying; going out
She _______ live with her parents, but she doesn’t now.
#52373
A
used to
B
is used to
C
was used to
D
has used to
Pandas will have enough places       .
#61259
A
to live in
B
to live
C
living on
D
live