—Guess what? I happened to have met Mark at the party last week. —If my memory serves me correctly, you two ______ each other for almost ten years.
Was it near the bridge ____ the car accident took place?
___in the air, this kind of steel become harder and harder.
In a chemical change, energy cannot be created ,____.
The Loisels did what they could ___ the debts.
The teacher entered the classroom, _____.