Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it's out of________.
—It can’t be too worse. —Just _______. Things will turn out to be better so long as you don’t stop trying.
The villagers have already known _________ we’ll do is to rebuild the bridge.
The development of industry has been ________ gradual process throughout ________ human existence, from stone tools to modern technology.
—What shall we do tonight then? —_______ -whatever you want.
It suddenly occurred to him ________ he had left his keys in the office.