Jim　isn’t　in　the　classroom.　Where　is　he？-　He　_____　to　the　teacher’s　office.

Shanghai is larger than __________ city in China. – Yes. And it is larger than __________ city in Jiangsu.

I think her dress comes from the 1970s.—It_________ be from that time. It looks so modern on her.

How long have you________?—Since two years ago.

Look at the boy running on the playground. Is it David? —- It ______ be him. I saw him go to the teachers’ office just now.