For a moment nothing happened. Then all shouting together.
| A．voices had come | B．came voices |
| C．voices would come | D．did voices come |
Only _______ as an interpreter _______ how important it is to grasp English.
| A．when did I work; I realized |
| B．when I worked; I realized |
| C．when did I work; did I realize |
| D．when I worked; did I realize |
The physics teacher once said that we first _____the lightning followed by thunders because light ______ faster than sound.
| A．see; traveled | B．saw; traveled |
| C．saw; travels | D．see; travels |
You'd better _______ your score and see if you have passed the exam.
| A．add up | B．add to |
| C．add up to | D．add |
Would it be for you to pick me up at four o’clock and take me to the airport?
| A．free | B．vacant |
| C．handy | D．convenient |
— Excuse me, what's the time for Train 8201?
— It _____ at seven and you can wait in the hall.
| A．left | B．leaves |
| C．will leave | D．has left |