We ________ take clean drinking water for granted. One day we may run out of it.
---Why did the police_____ the crowd?---Because the president’s car ____ in the street.
_____ production up by 60%, the company has had another excellent year.
He looked as if he _____ the answer.
Having you ever ______ in front of thousands of people at a concert, with everyone _____ while you were singing?
Tom was always _____ new and good ideas.