—I saw Mr. Green at school this morning. —No, it _____ him. He flied to Canada last week. A. can be B. must be C. can’t be
We ________ our hands while they were singing on the stage.
—Have you ever ________ to the Great Wall? —Yes, I _______ there last autumn.
The words _________ by Miss Li are marked ________ red.
Have you finished the work _________?
He’s gone to the library, ________he?