The telephone _______ three times in the last hour, and each time it ________ for my father.
| A．had rang； was | B．has rung； was |
| C．rang； has been | D．has been ringing； is |
Residents ________ not to go out alone or to take part in any groups during the period of recent terrorist activities. 
| A．were always being warned | B．are always warning |
| C．always warned | D．had always been warned |
The father, along with his four children _______ Hangzhou. When they will be back ______ fixed. 
| A．have gone to, isn’t | B．had gone to, is not |
| C．went to, aren’t | D．has gone to, has not been |
It is said that the number of Chinese characters users can type on their mobile phones is ______ the total number of Chinese characters. The reason is that the character input systems are made by foreign cell phone producers.
| A．25 percent as less as | B．less than 25 percent |
| C．25 percent much than | D．25percent as much |
The reform has changed the whole nation. It cannot remain _________ it used to be.
| A．what | B．where | C．which | D．when |
All the people in the nation can remember exactly how many years ago _______ the civil war broke out. 
| A．was it that | B．it was when | C．it was that | D．was it when |