－I’d like to help the homeless people in the earthquake. －You ________ join a volunteer group. 

 — She looks rather upset. She        the exam.— I guess so. It’s very difficult after all.

--- He worked out such different questions at a very young age.--- Oh, he ______ a very smart student then.

I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.

Generally speaking, there _______ be any survivors(幸存者) after such a long time. However, two young people were found _______. Life is super-nature!