There is one mistake in each sentence.Find and correct it
1.In 2050,the world's population will grown to 9 billion
2.Traffic congestion has become a serious problem in big cities,doesn't it?
3.The amount of motorbikes should be limited to reduce traffic jams
4. Forest areas are destroy to make space for new house
5.Less than thirty children each year develop the disease
6.Nearly one million people live in Dharavi,the largest slum of Mumbai
7.There are social causes of homeless,such asa lack of housing,poverty and unnemployment
8.Your father used to drink coffee every morning,usedn't he?
