帮我解决英语难题(汉译英4）

One,we need to reduce the chance of vehicles on the road in order to reduce fuel consumption.(Consumption) 2,electricity has increased our burden.(Add to) three,you should act in their own judgment,not always with your brother in the back.(Follow the lead) 4,which hairstyles are very popular this year,but I think next year will become obsolete.(In fashion) 5,in the course of the pursuit of truth,we are doomed (fate to) have to suffer the pain of failure.(In one's quest for)