. Before radio and TV, music could only be heard _______, that is, you had to go to places where musicians gave performances.
“I hope you don’t mind my pointing out your mistake.” “____”
Talking about the future career, I’d prefer ___ a teacher ___ be a secretary.
I can’t ___ him doing a thing like that.
Was it near the bridge ____ the car accident took place?
___in the air, this kind of steel become harder and harder.