Last night I met Mr. White , ___ used to be my maths teacher.
You cannot imagine what great trouble I took ______ your house.
Jordan kept his illness from his opponents before the final game ________ they might know about it.
— Have you seen ____ pencil? I left it here this morning. —Is it _____black one? I think I saw it somewhere.
---Now, children begin to learn English at a very early age. It is really a good thing? ---_________.
_______ caused the accident is still a complete mystery.