There were two boys in the lab, did the experiment successfully.
| A．the clever of whom |
| B．the cleverer or whom |
| C．the clever of them |
| D．the more clever of them |
He failed the mid-term examination and only then _______ how much time he had wasted.
| A．had he realized | B．did he realize |
| C．he had realized | D．he realized |
________confidence and the necessary equipment, they failed to rescue the 42 miners trapped in the coal mine.
| A．Having lacked | B．Lacking of |
| C．Lacking | D．Lack of |
A quarrel _________, which made him ______ his family.
| A．broke down; break out |
| B．broke out; break away from |
| C．was broken away; break down |
| D．was broken out; break away |
Tom is always ready to help me ______I come to ask him for help.
| A．at times | B．every time |
| C．sometimes | D．by the time |
The detective, _______to read a newspaper, glanced at the man _____ next to a woman.
| A．pretended; seated | B．pretending; seat |
| C．pretended; seat | D．pretending; seated |