23. We hear, see and read about problems in the world _________

A. once a week             B. every day                

C. every week   D. every year

24. What causes the air pollution?

A. fumes from vehicles.                        

B. poisonous gases from factories.

C. waste from everywhere                                

D. All are correct

25. The sea has become polluted because of _________

A. oil spills                                                         B. factories wastes

C. smoke from factories                       

D. A and B are correct

26. In order to make the world a better place to live, we _________

A. should not prevent pollution              

B. must find a good solution.

C. should kill the fish.                                        

D. None is correct.

27. The word “This” in the passage refers to _________

A. pollution                                B. oil               

  C. factory                      D. sea