Use the words from the right column in the appropriate forms to fill in the gaps. In (add) to the heavy traffic there were several factories there. Obviously the air-cleaning equipment they used was (effective) or did not work at all. When i asked my local friend why the people didn't insist on closing the factories he said people had different opinions about the point. Closing the factories was a very (controversy) issue actually. The gas emissions the factories were (response) for had a very negative effect on the environment.