Many experts seem to agree that _______ certain limit should be set on ________ consumption of cars to ease air pollution.
He had a lot of friends, only a few of ______ were invited to his wedding.
— Hello, Jim. I ______ to see you today. Sonia said you ______ ill. — Oh, I’m OK.
When the applause ______, Obama continued his speech.
By the end of last year, another new gymnasium ______ in Beijing.
When I was doing shopping last Sunday, I ______ Mr. Smith in the street.