---- What has made him look like lacking sleep?
----- _____ his wife is ill and he has to get up several times a night to attend to her.
| A．For | B．Because | C．That | D．What |
--- 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 |