You can’t imagine that a well-behaved gentleman __________ be so rude to a lady.

In China's countryside, villagers often have the same family name, but ________ not be closely related.

–Must I return the story book tomorrow, madam?       –No, you ______ bring it here next Monday.

(2013·江苏南通市二模)We ________ have hurried all the way to the airport — the flight was called off because of the foggy weather.

It’s said that there’re plenty of hotels in that town. There ______ be any difficulty for you to find somewhere to stay today.