Australia's main problem is water.

Australia's main problem is water. Rain is the main s-----of new water Australia is a nation of water babies, main problem Which river is the main source of London' water supply? Is panda's main food bamboo?回答 Water is ice`s tears! Australia is a large countey,but its population is s( ) It is reported that PM2.5 pollution is the main problem( )ai It is reported that PM2.5pollution is the main problem( )air It’s obvious what your problem is if there is/are any problem(s)