How is your recent trip to Sichuan?—I’ve never had ________one before.(2011·四川)

gh I majored in English, language _______ becamea challenge when I set foot in the USA for the first time.

Never in my life _____such a thing. [ ]

The word _____ can be used as an adjective .

Sun Yang, a young Chinese swimming talent, ________ several gold medals before the 2012 London Olympics