The pollution problem here seems to get more and more serious .Something ____with it .

Must I take out the trash?—No, you ________.

China is larger than _________ in Africa.

Everyone must __________ the security check (安检) before getting on the plane at the airport.— Yes. It’s necessary to ensure the passengers’ safety.

I am trying my best to learn English, but it doesn’t work well! —Don’t worry! Regard it _____ a big challenge! [ ]