That tree, __________ are almost bare, is a very old one.
It is the first time that Chinese astronaut Wang Yue________as one of the volunteers for the Mars-500 test project .
—I bought three DVD copies of the film Avatar and now is left. Somebody just borrows something and never returns. —Things like that happen all the time.
Among the most important questions the journalists wanted _____was how Greece could overcome economic crisis ?
It is most _____that the environmentalists will come to the area to investigate the possible damage caused by the serious pollution.
After the meeting, I to write a report on our next term’s work.