Don’t play with the dog, Jack, for it ______ be dangerous at times.
_______it not been for the free ticket, I would not have gone to the cinema.
The number of people invited __________fifty, but a number of them__________ absent for different reasons.
all the required papers, he didn’t answer the questions fluently in class.
With everything ________, the teacher started the slide show.
When help, one often says, “Thank you”, or “It’s kind of you.”