. The clever boy made a hole in the wall, _______ he could see ______ was going on inside the house.
| A．which;what | B．throughwhich;what |
| C．throughthat;what | D．what;that |
___is well known is that Africa had contacts with India and the Red Sea civilizations from the earliest times．
| A．As | B．It | C．What | D．That |
The truly homeless are the rich who ___ their home into a hotel hall．
| A．will turn | B．turned |
| C．are turning | D．have turned |
—George, ____ you sing so loudly at such a late hour?
—I am terribly sorry．
| A．will | B．may | C．must | D．shall |
All the drivers have been warned that driving after drinking shall ____ serious accidents．
| A．bring up | B．bring back | C．bring in | D．bring about |
Depression is the leading cause of suicide, ____ in turn is the third leading cause of death among 15 to 24 year olds in the United States．
| A．who | B．which | C．that | D．what |