Exercise a: Choose the correct options.
 * I would often jog along the sidewalk in our neighborhood in the morning.
   * Sidewalk is the correct choice as it refers to a path for pedestrians, typically alongside a road.
 * Some people from rural areas often struggle to find affordable houses in the city.
   * Struggle is the better fit as it conveys the difficulty faced by people from rural areas in finding affordable housing.
 * The city is trying to improve the crosswalks so that drivers can see them better.
   * Crosswalks are pedestrian crossings, so improving them will make it easier for drivers to see pedestrians.
 * To reduce traffic jams, the city decided to ban certain types of vehicles traveling into the city center during specific hours.
   * Ban is the correct option as it means to prohibit or forbid something.
 * The sudden heavy rain caused a traffic jam in the area for two hours.
   * Traffic jam is the appropriate term to describe a congested road.
Exercise b: Complete the sentences with the correct forms of the words in brackets.
 * We agree with the ban on the use of mobile phones while driving on the streets.
 * There was a sudden traffic jam because of a(n) accident.
 * The city received a lot of encouragement for improving the roads and traffic signs.
 * To make the project successful, it needs the involvement of businesses and residents.
 * To reduce pollution, the city council needs to discourage the use of cars for short-distance commuting.