______ about the safety of the people in the earthquake-stricken Lushan county in Sichuan Province, Premier Li has flew there to direct the rescue mission.
| A．Concerning | B．Concerned | C．To be concerned | D．Concern |
.I won’t call you, __________ something unexpected happens.
| A．unless | B．whether |
| C．because | D．while |
. He was told that it would be at least three more months __________ he could recover and return to work.
| A．when | B．before |
| C．since | D．that |
.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how |
| C．unless | D．where |
. Leave your key with a neighbor __________ you lock yourself out one day.
| A．ever since | B．even if |
| C．soon after | D．in case |
The news about the terrible flood there greatly discouraged __________ there for sightseeing.
| A．us from going | B．us to go | C．our going | D．our to go |