求助~~选择It's repoeted that the USA is the word's biggest ollut

it's only the word that is The word's population is one of the biggest of the word toda A word that has changed the world,what's it? 英语翻译There is growing belief that the biggest city of the 21s Shang hai is the biggest city in China.It's _____ the Huangp 完形填空mother's Day is celebrated in the Usa .it's also a holid 单项选择The girl____the USA is my son,s English teacher A.is fro Wuhan is in Hubei p___.It's one of the biggest cities in Chi and it is also home to north america s the second biggest ch It's(common)in the USA that students have classes on sundays Do you know Mexico?It is to the s____part of USA.It’s not a Do you know Mexico?It is the s_____ part of USA.It’s not ad_