1- a situation when you waited for a bus or a train 2- a challenging profession you know about

What are the differences between using bicycles and private cars?
A.
 
Bicycles and private cars have differences. Though you need no fuel and 
there are some health benefits of a bicycle, you cannot ride more than two 
people together and it takes times to reach places riding a bicycle. This is not a 
speedy mode of transport while the cars are speedier than a car. Besides, the 
seats are uncomfortable on a bicycle while the car seats are comfortable and 
spacious. But you need to get fuels for the car while your physical labour is 
enough to drive the bicycle ahead. Safety is not ensured for any of the modes 
but if you are careful, you can stay safe.