The population of the world in 20th century became very much _________than that in 19th.
It’s very dangerous when you drive your car ______ a certain speed.
Though he is a manager of a big company, he makes ______ a rule to have supper with his family every day.
The letter “u” in the word “______” has a different pronunciation from the others.
If you develop a ______ of talking with others in English, you’ll improve your ability in speaking.
—The Underground Line No. 3 has been in service for about a month.—How exciting ______ news is!