Xiao Shenyang says that _________ job is to make people happy.

Who’s the man over there?Is it Mr. Black?——It______be him. He’s much taller.

The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.

They aren’t our books. Are they___________?

Miss Liu is English teacher. She teaches English very well.