We all know that dinosaurs lived on the Earth more than ______ years ago.

People that lived in the mountains didn’t have wells in the past, so they had to ______ water from a stream far away.

It was during World War II, ____ he was in his early twenties, _____ he joined the British Army

She _________ for 15 years ,yet she didn’t know what kind of man she _______ .

“Run away from Beijing, Shanghai, and Guangzhou” has been a slogan for some of China’s younger generation______ are under unbearable economic pressure to survive in cities