---Has your father returned from Africa yet? ---Yes, but he _______here for only three days before his company sent him to Australia.
Discovered by the Portuguese in 1506 and _____ in 1810, the island belongs to the Great Britain and has a population of a few hundred.
Perhaps the best sign of _____ computer and internet use pushes up demand for paper comes from the high-tech industry itself.
Until recently, land in large area of Stockholm belonged either to the crown or to the city; there was _____ thing as private ownership of land.
Some people disagree with the idea _____ digital textbook will improve education quality while the traditional textbook is out of date.
Probably, no man had more effect on the daily lives of most people in the United States _____ Henry Ford, a pioneer in automobile production.