A lot of traffic was kept from going into the city centre the heavy snow?
| A．because of | B．thanks to | C．thanks for | D．with the help of |
He improved his English a lot ______ listening to the radio.
| A．with | B．by | C．for | D．on |
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 |