—The cars give off a great deal of waste gas in the street.
—Yes, But I’m sure something will be done to       air pollution.

—The cars give off a great deal of waste gas in the street.
—Yes, But I’m sure something will be done to       air pollution.

1. A.
   reduce
2. B.
   remove
3. C.
   collect
4. D.
   warn

—The cars give off a great deal of waste gas in the street.

—Yes, But I’m sure something will be done to        air pollution.

A．reduce      B．remove     C．collect             D．warn