Traffic jams in Viet Nam frequently take place in big cities, such as Ha Noi and Ho Chi Minh City. There is no fixed rule for the time a traffic jam happens. But It is worse during the rush hour when everyone is in a hurry to get to work or come back home. Apart from peak hours, the time between 9 a.m. to 10 a.m. and between 3 p.m. to 4 p.m. also witnesses long lines of vehicles, mainly motorbikes. When it rains, the traffic jams get more terrible. Taxis are extremely hard to catch or wave during the downpour. However, the most annoying thing about the traffic jam is the way people react to it. Most road users ride their motorbikes on the pavement rather than waiting calmly. Moreover, they constantly use their horns to hasten riders in the front, even shouting at them from time to time.

1. what is the passage mainly about?
a) the causes of traffic jams in Viet Nam
b) the effects of traffic jams in Viet Nam
c) the reality of traffic jams in Viet Nam
d) the solutions to reduce traffic jams in Viet Nam
2. when is traffic congestion in Viet Nam the worst?
a) when everyone goes to work 
b) between 9 a.m to 11a.m
c) between 3 p.m to 5 p.m 
d) at the weekend