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.