You have to keep alert when you are in the supermarket; otherwise, you might _____ what you actually don’t need at all.
Oh, boy, why are you killing your time this way? Can’t you find something _____ doing?
I am going to do all I can _____ the bad impression you have of me.
The company was willing to provide us with what we needed, _____ made us excited.
_____ the doctors really doubt is _____ my mother will recover from the serious disease soon.
The students of the music school study ____.