The following sentences contain blanks. Use the drop-down menus to complete each blank correctly. Several regions in Asia contain valuable natural resources. Stretching for about five million square miles across Russia, [Dropdown 1] is rich in oil and natural gas. Azerbaijan, Turkmenistan, and Kazakhstan, countries along the [Dropdown 2] , contain large deposits of natural gas and crude oil. Notably, one natural resource that central Asia has little of is [Dropdown 3] , with only about 1.24 percent of the region covered by forests.