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
 ---________? ---He is quiet and doesn’t like talking much.
#52812
A
What would he like?
B
What does he look like?
C
What’s he like?
D
What does he like?
You look tired. You’d better______ a good rest. 
#52589
A
stop to have
B
stop having
C
to stop to have
D
to stop having
 The teacher asked the boys ____on the wall.
#53866
A
to not draw
B
don’t draw
C
not draw to
D
not to draw