Mary is ______ a translation of a French novel.

Oh, boy, why are you killing your time this way? Can’t you find something _____ doing? 

Don’t talk to Simon like that. He is just an _______ boy. 

By popular consensus, great painters can mix the colours together within a short period of time to get the __________colour.    

I’m surprised that you should have been fooled by such a(an)＿＿＿＿＿trick.