. It is the first time that Chinese astronaut Wang Yue________as one of the volunteers for the Mars-500 test project .
Once __________, the play was well received by the public.
__________ more time, they will do a better job.
__________ with such a difficult problem, he decided to ask for some good advice from his colleagues.
The leader came into the room, __________ by his two assistants.
__________ by the heavy rain, the area was flooded seriously.