— Could you give _______ an introduction to the new machine?— Of course. I will tell you how to use it.
The thought of going back home was_______kept him happy while he was working abroad.
By improving reading skills, you can read faster and understand more of______you read.
_______parents say and do has a life-long effect on their children.
Choosing the right dictionary depends on ______ you want to use it for.
Having checked the doors were closed , and _________ all the lights were off, the boy opened the door to his bedroom.