This shop will be closed for repairs ________ further notice.
| A．with | B．until |
| C．for | D．at |
-I was amazed to find that you are an excellent cook.
-I have experience __________ cooking at an Italian restaurant.
| A．of | B．in |
| C．at | D．on |
Strong __________ can be very dangerous for swimmers.
| A．flows | B．columns |
| C．floods | D．currents |
Mr Brown is a（n）__________ secretary in our office, for he is able to do tasks successfully, without wasting time and energy.
| A．effective | B．efficient |
| C．flexible | D．sufficient |
It was nearly an hour __________ the sleeping pill __________ effect.
| A．when; took | B．before; took |
| C．since; takes | D．before; would take |
The boy's father insisted that the boy __________ badly and that he __________ to the nearest hospital at once.
| A．be hurt; should be sent | B．be hurt; should send |
| C．was hurt; be sent | D．was hurt; would be sent |