Who is the man over there? Is it Mr. Wu? — It ________ him, but I am not quite sure.

—What have you learned from your experience in Thailand?—Well, meeting people from another culture ______ be very difficult．

—Can I pay the bill by check?     —Sorry, sir. But it is the management rules of hotel that payment _____ be made in cash.

—Is Jack on duty today? —It ______ be him. It is his turn tomorrow.

If I _______ plan to do anything I wanted to, I’d like to go to Tibet and travel through as much of it as possible.