The population of the city is three times ____it was 50 year

The population of the city is three times ____it was 50 year The population of the city is three times what it was in the The present population of this city is three times（ ）it was ________ is the population of the city? ______ is the population of the city? ---------------is the population of the city. The population of our country is now more than three times w what is the population of your city Last year,the population of that city _____7,120,000 the production is now three times what it was ten year ago 其 _____ is the population of the city?选什么 The products of wheat increased (by) three times this year