I admired my classmate Lisa very much. ______ herprettiness, she was smart and helpful.

I wonder if I can board the plane with this return ticket. — There _____be no problem. Your ticket is valid until the end of this month. [ ]

Did you find out the time of the train to Miami? —Yes, the early train is _______ to leave at 5:30 a.m.

There’s no light on — they __________ be at home.

I don’t know _________ the problem.