-- The cars give off a great deal of waste gas in the streets.

   --- Yes. But I’m sure something will be done to ___ air pollution.

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

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

—Yes.But I'm sure something will be done to________air pollution.

A．reduce  B．remove  C．drop  D．warn

---The cars give off a great deal of waste gas in the streets.

---Yes. But I'm sure something will be done to ________ air pollution.

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

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

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

-The cars give off a great deal of waste gas in the streets.

-Yes. But　I'm sure something will be done to         air pollution.

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