Add spaces: Forinstancepeopleingeneraldoubtwhetheritisdiesel-orgasolinecarsthatespeciallyarethesourcetoparticlepollution(only63%knowtherightanswer).And,only73%knowthatitispossibletoeconomizefuelbythewayyoudriveyourcar.

Answer: For instance people in general doubt whether it is diesel- or gasoline cars that especially are the source to particle pollution (only 63% know the right answer). And, only 73% know that it is possible to economize fuel by the way you drive your car.

Add spaces: Relter4lUnitedStates,Philadelphia.42yearsold

Answer: Relter4l United States, Philadelphia.42 years old

Add spaces: Extensionofsutterangvaningandflatonthegroundfloor.

Answer:
Extension of sutterangvaning and flat on the ground floor.