37. Ha Long city / have/ some traffic problems

=> Ha Long city has some traffic problems

38. there / many people /use/ the road / too many vehicles / roads.

=> There are many people using the road for too many vehicles on the roads

39. many roads / narrow / bumpy .

=> Many roads are many narrow and bumpy

40. many young children / ride / bikes/ dangerously.

=> Many young children ride bikes very dangerously 

41. I / think / people/ be/ careful / obey / traffic rules.

=> I think people are careful to obey the traffic rules

37. Ha Long city has some traffic problems.

38. There are many people using the road for too many vehicles on the road.

39. Many roads are very narrow and bumpy

40. Many young children ride bikes very dangerously.

41. I think people should be careful to obey the traffic rules.