Only then, _____we ____that the trapped miners were in danger when the flood water dripped into the tunnels.
| A．have; realized | B．did; realize |
| C．do; realize | D．had ; realized |
Two middle-aged passengers fell into the sea. __________，neither of them could swim.
| A．happen | B．occur |
| C．Naturally | D．Unfortunately |
Students are always interested in finding out __________ they can go with a new teacher.
| A．how far | B．how soon |
| C．how often | D．how long |
______ by Typhoon Morakot （莫拉克），Taiwan __________ water and electricity shortage.
| A．Having struck; facing | B．Having struck; faced |
| C．Struck; facing | D．Struck; faced |
We had never __________ this kind of holiday before and had no idea what to expect.
| A．went | B．tried out |
| C．experienced | D．heard |
The telephone __________，but by the time I got indoors, it stopped.
| A．had rung | B．was ringing |
| C．rings | D．has rung |