Duty is an act or a course of action that people ____ you to take by social customs, law or religion.

I always prefer _______ a bike rather than _______ to work.

More than _______ of the classmates in my class ____ fond of pop music．

---I’d like to go to the movie with you, Dad. ---Sorry, my son, but only the grown-ups are ________ into the cinema.

He once remarked that "All happy families ________ one another, but each unhappy family is unhappy in its own way".