Pollution is a serious problem. Scientists have _____ some good ways to save it. 
#54132
A
come up with
B
come on
C
come out
D
come up
推荐题目
My grandmother looks forward to _________my aunt in Hong Kong.
#56095
A
hanging out
B
taking a trip
C
hearing from
D
turning down
How muchI’m looking forward       you!
#52367
A
seeing
B
to seeing
C
for seeing
D
at seeing
         —How about going shopping this weekend, Peter? —Sorry. I prefer ______ rather than ______.
#63225
A
to stay at home, go out
B
to go out, stay at home
C
staying at home, go out
D
going out, stay at home
There is _______ with your computer. Why not have it _______?
#60601
A
nothing wrong; repaired
B
nothing wrong; repair
C
something wrong; to repair
D
something wrong; repaired