1. Where do traffic problems and pollution frequently happen? a. small towns

The weather was so beautiful that we decided to go to the beach. => So _____.           

The film had ____ started by the time we got to the cinema.

In the other two _______, millions of americans enjoy basketball.

Make a non-defining relative clause from the two sentences

Catherine ruled Russia for over 30 years.she made many important changes.

2. According to the passage, what causes traffic congestion in big cities?

3. The high number of cars is caused by_________

4. The highway and road network is ________ of meeting the requirement of increasing number of vehicles.

5. Which of the followings is NOT true?