Ответ:

  1. I love living in the city, but I don't like the high cost of living.
  2. My father hates driving in heavy traffic.
  3. The streets in London are very crowded.
  4. In the country you usually meet friendly and helpful people.
  5. We go for a walk in the country, because we need some peace and quiet.

Ответ: 1) cost; 2) heavy; 3) crowded; 4) helpful; 5) peace.