She has been working hard day and night, which of course, _______ her pale face.
A．accounts for B．stands for
C．goes for D．answers for
--- Are you satisfied with what he did?
--- No. It couldn’t have been ______.
A．worse B．better C．so bad D．the worst
--- He worked out such different questions at a very young age.
--- Oh, he ______ a very smart student then.
A．could have been B．should have been
C．might have been D．must have been
In our childhood, we were often ______ by Grandma to pay attention to our table manners.
A．demanded B．reminded C．allowed D．hoped
Many lifestyle patterns do such _____ great harm to health that they actually speed up ____ weakening of the human body.
A．a; 不填 B．不填; the
C．a; the D．不填；不填
Stay awake! You should know that it ________ to sleep in class.
A．doesn’t permit B．is not permitted
C．will not be permitted D．was not permitted
