The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
alternative
aggressive
ambiguous
apparent
UN Secretary-General Ban Ki-moon left for Pakistan this morning, his assistant _________ him there this Friday.
______, the conference began.
Zhang Ziyi and Wang Feng, both of them ______ in the media spotlight, get romantically involved.
Entering the bookstore, I noticed a girl _______ against the window, with her eyes_____ on her book in hand.
In the middle of February, the weather__favorable for work, the workers began to repair and secure the dam of the river.