The air in Dongying is much worse than that in many other cities. We must do       to protect our environment. 
#36921
A
nothing
B
anything
C
something
D
everything
推荐题目
I know the importance of the math test. It _______ 30% of the final exam. 
#42424
A
makes of
B
makes into
C
makes up
D
makes from
_____________have they been married? —For twenty years.
#40931
A
How far
B
How long
C
How often
D
How soon
---What’s Mother doing, Jim?---I don’t know. She ________Zhou Libo’s show at her bedroom.
#37857
A
may be watching
B
must be watching
C
is watching
D
should watch