Chia từ thích hợp :Give the correct form of the words in brackets.;Traffic jam (to be )______a common sight in big cities like Delhi ,Mumbai,Calcuttaetc .This is due to (increase)__________population of the metropolitan cities.People from far off places rush towards big cities to (earn)______________as big cities (have)__________many options and possibilities for them.Then there are permanent citizens also.So with the human traffic,vehicular  traffic also increases.As the standard of living (becomes)________high everyone wants to (purchase)_______his own car