A. If people breathed contaminated air, they had breathing problems.

B. If people breathed contaminated air, they would have breathing problems.

C. If people breath contaminated air, they have breathing problems.

D. If people breath contaminated air, they will have breathing problems.

A. Many people in this area have cholera because they drink untreated water.

B. Many people on this area have cholera because they drink untreated water.

C. Many people on this area have cholera because they drink untreating water.

D. Many people in this area have cholera because they drink untreating water.

A. The street not look attractive because there’s a lot of rubbish.

B. The street not look attractive because there’re a lot of rubbish.

C. The street doesn’t look attractive because there’s a lot of rubbish.

D. The street don’t look attractive because there’re a lot of rubbish.

A. The music club is making so much noise that the residents require them to turn the music down.

B. The music club is make so much noise that the residents require them to turn the music down.

C. The music club be make so much noise that the residents require them to turn the music down.

D. The music club be making so much noise that the residents require them to turn the music down.

A. Visual pollution prevents us from seeing far away.

B. Visual pollution prevents us with seeing far away.

C. Visual pollution prevents us on seeing far away.

D. Visual pollution prevents us of seeing far away.

A. What pollution of types is the most harmful to human?

B. What types of pollution are the most harmful to human?

C. What the most types of pollution is harmful to human?

D. What is types of pollution harmful the most to human?

A. Sewages as rivers from factories poison water bodies such and lakes

B. Sewages and lakes from factories poison water bodies such as rivers.

C. Sewages from factories poison rivers and lakes such as water bodies.

D. Sewages from factories poison water bodies such as rivers and lakes.

A. Plastic bags are the one of main source of pollution.

B. Plastic bags are one of source of the main pollution.

C. Plastic bags are one of the main source of pollution.

D. Plastic of bags are one pollution of the main source.

A. Soil food results in unsafe contamination.

B. Soil contamination results in unsafe food.

C. Soil unsafe results in food contamination.

D. Soil results in contamination unsafe food.

A. If there were more trees in the area, the air would be fresher.

B. If were there more trees in the area, the air would be fresher.

C. If there would be more trees in the area, the air were fresher.

D. If the air were more trees in the area, there would be fresher.

A. Applying lights in almost everything at night is very wasteful.

B. To apply lights in almost everything at night is not wasteful.

C. Almost everything is wasteful at night.

D. It’s interesting to apply lights in almost everything at night.

A. Famers use too many pesticides and herbicides, but the soil is poisoned.

B. Famers use too many pesticides and herbicides, for the soil is poisoned.

C. Famers use too many pesticides and herbicides, so the soil is poisoned.

D. Famers use too many pesticides and herbicides, or the soil is poisoned.

A. Unless you don’t stop swimming in that lake, you will have a rash.

B. Unless you stop swimming in that lake, you will have a rash.

C. If you don’t keep swimming in that lake, you will have a rash.

D. Unless you keep stop swimming in that lake, you will have a rash.

A. The polluted water causes in the death of many aquatic animals and plants.

B. The polluted water leads to the death of many aquatic animals and plants.

C. The polluted water causes to the death of many aquatic animals and plants.

D. The polluted water leads in the death of many aquatic animals and plants.

A. If people don’t use too many vehicles, the air won’t be polluted.

B. If people won’t use too many vehicles, the air don’t be polluted.

C. If people wouldn’t use too many vehicles, the air didn’t be polluted.

D. If people didn’t use too many vehicles, the air wouldn’t be polluted.