Now everybody has seen ＿＿problem pollution is

Now everybody has seen ＿＿problem pollution is Air pollution is now a serious problem in China 英译汉 Pollution isn't a big problem now,is it?( ) Pollution isn't Discovering consists of seeing what everybody has seen and＿＿ Pollution is a w______ problem. the pollution of SO2 is now the most dangerous problem of ai pollution isn't a big problem now,is it 怎么翻译 连词成句1.now,in,pollution,a,the,is,world,problem,serious(.)2.wo today pollution has become a seriously problem on earth. Brain Teasers:What has everybody seen before but will never What's wore is that pollution has Air pollution has become the biggest (o ) inthe city now.