The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
American Indian ______ about five percent of the U.S. population.
There are plenty of jobs ______ in the western part of the country.
–I’d like some more cheese. –Sorry, there’s ______ left.
Yesterday she sold her car, ______ she bought a month ago.