It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |
There used to be a coffee shop next to your house , ?
| A．wasn’t there | B．didn’t there | C．wasn’t it | D．didn’t it |
—The phone is ringing —Who could be? It is already midnight .
| A．he | B．it | C．this | D．there |
Her dog ran out of the yard the old lady opened the gate .
| A．moment | B．a moment | C．the moment | D．that moment |
I always regret notharder when I was young .
| A．studying | B．having studied | C．to study | D．to have studied |
Catherine is one of the brightest students who from the Department of Computer Science , Brown University .
| A．is graduated | B．has graduated | C．are graduated | D．have graduated |