_____ this something, still unseen, they gave the name radium. 

I used to be able to play well but I'm _____ now.

—Where _____Chongqing do you decide to build the factory ? —Nobody _____ our manager knows .

The manager and general engineer _____ very strict _____ his employees and ____ his work as well．

Michael really has a gift ______ playing the piano so his teacher decided to make a pianist of him.