With many cities in China dreadfully blanketed by thick haze, the environment problem is _____ Chinese people concern most nowadays.
— How is everything going? — It couldn’t be _______, for I lost my wallet this morning.
Mary _______ be in the hospital. I saw her play basketball a minute ago.
While giving the speech, Doc. Kim ____________ his notebook now and then.
—It’s really a __________ story! —Exactly. Almost everybody was __________.
The ordinary house _________ we visited three days ago used to be the house of Victor Hugo, a well-known litterateur(文学家).