I don't know ____________.
The man has been in____ doctors describe as a vegetative(植物的) state for six years.
But for the fact that Ian unexpected visitor, I _____to the lecture.
The old man, forlife had been very hard, donated his possessions to poor villages in Anhui.
--Why do you look so upset, Linda? --There are so many troublesome problems____.
I lost the key to my dormitory. Could you ____ for the night?