1、Over Spring Festival,all the family members get together to celebrate/observe the traditional festival.
2、This report presents the poverty of children in front of/before people
3、 With the development/advance of society,it has seen a increasing number of private cars and the deteriorating fact of traffic jam.Parents therefore fear that their children may get stuck in traffic jam on the way to school
或者 As the society develops,there are more and more private cars and the traffic jam is getting increasingly serious.Parents therefore fear that their children may get stuck in traffic jam on the way to school (第二种译法很普通,第一种个人感觉比较地道更简洁更现实语言水平)
希望可以帮到你!