The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
Ellen is _____ in both English and French, which gives her an advantage over other candidates.
We should consider what use can _____ such a material.
_____ on facts, the report should be reliable(可靠的).
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.