.Have you considered the students’ request _________ the school library _______ more books on popular science?
I’m surprised to see you are a chain smoker. You _______ , I remember.
After ten years of hard work, the Browns _______ all their debts.
_______ is known to us is that time is limited and precious.
―Can you finish the reports today? ―Sure. I’ve ____________ half of them already.
―I didn’t know you were here so early. What’s up? ―____________