Grammar Exercise #10

Air pollution can ..........DEFINEBE DEFINED as the addition of something harmful to the air at a faster rate than it can ..........ABSORBBE ABSORBED. Everyone should be concerned about air pollution. It ..........AFFECTSIS AFFECTED us all, and as it ..........CONTINUESIS CONTINUED to worsen, so the environmental impact increases.

One of the major causes of air pollution in cities is car use. Cars ..........USEARE USED for even the shortest of journeys, and all efforts by governments to encourage people ..........TO USETO BE USED public transport seem to be failing. Industry is another major cause of pollution in our cities, but fortunately, new industrial sites ..........ARE BUILDINGARE BEING BUILT away from large urban centres.

It ..........SAYSIS SAID that there are too many contributing factors for us ..........TO DECIDETO BE DECIDED exactly which one is the main problem, but I believe that one of the most serious problems that needs ..........TO TACKLETACKLING is the use of the car. In some cities laws ..........HAVE PASSEDHAVE BEEN PASSED concerning car use. Athens, for example, only ..........ALLOWSIS ALLOWED a certain number of cars into the city centre each day. In my opinion, this is a good idea. With this kind of law people have no choice and ..........FORCEARE FORCED to use buses and trains. This ensures governments ..........KNOWIS KNOWN that public transport ..........WILL USEWILL BE USED, and can therefore justify the investment and expense of ensuring the system works properly.

Another thing governments could do is to force people to ..........HAVE THEIR CARS CHECKEDCHECK THEIR CARS for carbon emissions and fine people with cars that produce high levels of harmful gases.