_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
| A．/; the |
| B．the; a |
| C．a; / |
| D．a; a |
Ellen is _____ in both English and French, which gives her an advantage over other candidates.
| A．practical |
| B．grateful |
| C．exact |
| D．fluent |
We should consider what use can _____ such a material.
| A．be made of |
| B．be made from |
| C．be made up |
| D．be made in |
_____ on facts, the report should be reliable(可靠的).
| A．Based |
| B．Basing |
| C．To be based |
| D．To base |
There were so many people in the street watching the fire that the firefighters could not get _____ to the building on fire as soon as possible.
| A．closely |
| B．close |
| C．around |
| D．in |