39. Traffic jam/ one/ most common/ issue/ big city/ world.
- Traffic jam is one of the most common issue in the big city on the world.
40. There/ many/ people/ use/ road/ and/ one/ main reason/ cause/ traffic/ jam.
-There are many people use the road and it is one of main reason cause trafic jam.
41. We/ solve/ traffic problem/ by/ encourage/ people/ use/ bicycle/ rather/ car/ short trip.
- We are solving the traffic problem by encouraging people to use bicycle rather use car in the short trip.
42. People/ use/ public transports/ reduce/ number/ private vehicles/ road.
-People should use public transport to reduce the number of private vehicles on the road.