The reason why he was sent to the hospital was __________ he was ill.
| A．that | B．because | C．since | D．why |
AIDS control and prevention is a ___ to China as well as the whole world.
| A．surprise |
| B．challenge |
| C．reaction |
| D．threat |
The fresh air on the farm ___ him ___ his headache.
| A．cured; for |
| B．rid; of |
| C．treated; for |
| D．cured; of |
Once ___ light, the film will be damaged and get useless.
| A．exposed to |
| B．exposed in |
| C．exposing in |
| D．expose under |
The patient has been ___ by nurses night and day since the operation.
| A．attended to |
| B．tended to |
| C．attended on |
| D．tended on |
You can have your computer repaired by John, which is ___ he is ___.
| A．what; expert |
| B．where; expert in |
| C．what; expert in |
| D．that; expert |