When a new disease breaks out，experts must what to do in the fastest way．
| A．figure out | B．take out | C．point out | D．make out |
I went to see Professor Johnson, only ______ that he had left the city the night before.
| A．to learn | B．learn |
| C．learned | D．learning |
Joining the firm as a clerk, Peter got rapid promotion, and ______ as a manager.
| A．turned up | B．brought up |
| C．ended up | D．showed up |
I am ______ about what I say because careless remarks are likely to hurt others’ feelings.
| A．enthusiastic | B．sensitive |
| C．doubtful | D．cautious |
The storm came so suddenly, otherwise they ______ such great loss when it struck.
| A．couldn’t suffer |
| B．wouldn’t have suffered |
| C．shouldn’t suffer |
| D．needn’t have suffered |
______ tablet computers like Apple’s iPad just before bed, a researcher says recently, can lead to a poor night’s sleep.
| A．Using | B．Used | C．To use | D．Use |