I think natural wonders are more interesting than man-made ________.
| A．one | B．it | C．ones | D．them |
The students hurried to the classroom ________ the bell rang.
| A．until | B．as soon as |
| C．if | D．so that |
We were angry ________ him for keeping us waiting.
| A．with | B．at | C．for | D．on |
Tony is ________ to go to school.
| A．enough old | B．old enough |
| C．enough young | D．young enough |
Sam worked until midnight yesterday. So he feels ______ today.
| A．sleep | B．asleep |
| C．sleepy | D．sleeping |
He failed the exam ________ he was too careless.
| A．because | B．but |
| C．so that | D．so |