It is believed that human beings had a single language or means of communication before the ____.

There are quite a few ____ species of animals nowadays. If we are not careful, they will disappear. 

The word means...

A ghost ____ at the public park yesterday and scared everyone. 

What does the phrase or sentence you heard mean?

Which of the following is an indefinite article?

Some people believe that the human species will eventually go ___.

He has ____ of time. 

What's your work ___? That is, what time of the day do you work?

He made ____ attempts to win but he always lost.

As we _____ apart so did our love. 

What part of speech is the word "tiring" in "The man is so tiring."