-You look so worried, what’s wrong? -More and more people like me begin to worry about the ______ pollution after the haze (雾霾) appeared in Beijing and some other cities in China.
Many American students think Chinese is __________ any other foreign language.
We are _______ tired to go any ____________. Let’s stop to have a rest.
--- Can I have ________________________? ---Of course. Here you are.
We all think he is one of _________ in our school.
She is very helpful and ready to help people ___________________.