—Have you worked here since you graduated?
—No, I ____________at a factory in Beijing for six years.
| A．would work | B．have worked | C．had worked | D．worked |
She ________a chain to the dog's collar.
| A．granted |
| B．kept |
| C．attached |
| D．beard |
You can take as many as you like, because they are free of________.
| A．fare |
| B．charge |
| C．money |
| D．pay |
—Who is the man ________here?
—Captain Cook.
| A．in the charge |
| B．under the charge |
| C．in charge |
| D．in a charge |
—Are the new machine working?
—Yes. Three million tons of coal________exploited every year in the city.
| A．is |
| B．are |
| C．has |
| D．have |
Everyone here thanks the firefighters for the things they have done to prevent fires________the environment safer.
| A．to make |
| B．to making |
| C．from making |
| D．make |