---How much money did you pay for the drink?---None. It’s ______.
I will never forget the fire ______________ happened in Shanghai last year.
—Mike has won the first prize in the English competition.—___________ pleasant surprise he gave her mother!
I hear that Zhengzhou Subway Line No.1 ____________ in 2012. Is it true?
—Your house looks so beautiful! When did you buy it?—I _________ since half a year ago.
When I fail and want to give up, my teacher always encourages me ___________ in myself and have confidence in myself.