— I think the man over there must be Bob.— It _______ be him. He has gone to England.
I didn’t see Tom last night. Where was he? --- He______ an interesting book at home.
Nobody can live________ fresh air and clean water.
My brother is honest boy, he never tells a lie.
—Hello, may I speak to Sandy, please? —_________.
—May, your new house looks so beautiful. —_________.