Having been attacked by terrorists，________．
| A．doctors came to their rescue | B．the tall building collapsed |
| C．an emergency measure was taken | D．warnings were given to tourists |
She was surprised to find the fridge empty; the childeverything!
| A．had been eating |
| B．had eaten |
| C．have eaten |
| D．have been eating |
When I got on the bus, II had left my wallet at home.
| A．was realizing |
| B．realized |
| C．have realized |
| D．would realize |
Frank insisted that he was not asleep I had great difficulty in waking him up.
| A．whether |
| B．although |
| C．for |
| D．so |
It was a nice meal, _______a little expensive.
| A．though |
| B．whether |
| C．as |
| D．since |
Suddenly a good idea me that I could use a computer to do the job.
| A．formed |
| B．came to |
| C．occurred |
| D．struck on |