The development of industry has been ______ gradual process throughout ______ human existence, from stone tools to modern technology.
The traffic rule says young children under the age of four and less than 40 pounds must be in a child safety seat.
Today's children are raised in a way that is totally different from how their parents were___.
Wilma became the first American woman to win three Olympic gold medals in track, _____ made her mother very happy.
She went to the bookstore and bought
My teacher inspired ____ a summer course to improve my writing skills.