—Paul, do you _________ an American friend?—No, I don’t. But my sister __________ one.
Either you or I ______ going there tomorrow.
Our English teacher is kind ________ helpful.
As a doctor, you can’t be ________ careful.
--- Tom, would you please not make so loud noise? Dad is sleeping. ---- _________, mom.
---Why is the woman crying there? ---Because she is ______. Her only son is lost and no one can help find him now.