That hazy（雾霾）weather has hit 104 cities in middle-east China lately makes citizens well aware of ______a terrible problem China is faced with.
#65940
A
what
B
how
C
which
D
that
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_______ they may have, the CEO of the corporation calls on all the staff to gather their courage to strive it.
#66086
A
What a serious problem
B
However a serious problem
C
How serious a problem
D
Whatever a serious problem
_______over everything whenever we want to make a decision, many people believe, and we will have less chance of making mistakes.
#65967
A
Think
B
Thinking
C
To think
D
Thought
____________ make so much noise. The students are taking an exam.
#59433
A
Isn't
B
Doesn’t
C
Don’t
D
Haven’t