The Internet is a very useful invention for us, ______ we can do lots of things at home.
—When shall we start the reconstruction of the old buildings? —Not until_ by the local government.
The man has been in____ doctors describe as a vegetative (植物的) state for six years.
But for the fact that I_ an unexpected visitor, I _____to the lecture.
The old man, for _life 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____.