The experiment shows that proper amounts of exercise, if ___ regularly, can improve our health.
| A．being carried out |
| B．carrying out |
| C．carried out |
| D．to carry out |
“You’ve left the light on.” “Oh, so I have. _____ and turn it off.”
| A．I’ll go | B．I’ve gone |
| C．I go | D．I’m going |
.Mr. Smith ________ me to buy several ________ eggs for the dinner.
| A．asked; dozen | B．suggested; dozens of |
| C．had; dozen | D．persuaded; dozens |
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 |