You may fail in the exam________you study hard．
A．until
B．if
C．because
D．unless
The thief got________a fright that he dropped the bag onto the ground．
A．so
B．very
C．quite
D．such
She was late for class because her mother forgot to________．
A．wake her up
B．wake up her
C．put her up
D．put up her
Don’t make any________．The baby is sleeping in the next room．
A．shout
B．sound
C．voice
D．noise
（2014陕西）Look！Laura is getting the first place．________fast runner she is！
A．How
B．What
C．How a
D．What a
（2014江苏扬州）—The air pollution is terrible．
—It will be worse________we take action to protect the environment．
A．if
B．unless
C．until
D．when
