Read the text and choose the correct answers:      

  Living in a city has a number of drawbacks. Firstly, there is the problem of traffic jams and traffic accidents. The increase in population and the increasing number of vehicles have caused many accidents to happen every day. Secondly, air pollution negatively affects people’s health, and it also has a bad influence on the environment. More and more city dwellers suffer from coughing or breathing problems. Thirdly, the city is noisy, even at night. Noise pollution comes from the traffic and from construction sites. Buildings are always being knocked down and rebuilt. These factors contribute to making city life more difficult for its residents. 

 1. How many drawbacks of living in a city are mentioned in the paragraph?