If there were more trees in this area, the air ( be) _____________ fresher.

Water ________________ in the lake has made the fish die.

Water pollution is the ________________ in the lake has made the fish die.

Hundreds of houses destroyed after a tornado hit the small town of Texas.

A                                    B                           C                 D

The earthquake occurred at midday when many people had had lunch.

                              A                 B                  C                    D

Factories don’t dump waste into rivers if the government fines them heavily.

 A                 B                         C                                                                 D