With the development of the Internet，______ communication is done by regular mail.

Gun control is a subject _______ Americans have argued for a long time.

Though she was disabled,she maintained a positive attitude ______ human life

The Chinese lunar New Year usually ______ two records: the world’s most watched television gala show and its busiest telecommunications network.

I’m sorry,but there’s no smoking on this flight.—Oh,I _______ that.Sorry, I won’t again