Remember everybody you meet online is a stranger. So when you can’t see a person, they could be _________.
Asked if he could come to the party that night, _____.
The first textbooks _____ for teaching English as a foreign language came out in the 16th century.
I can’t _____ you running up and down all day long.
Why do you have the water _____ all the time?
Deeply _____, I thanked him again and again.