The moment she came back from work, she ______ to clean the kitchen thoroughly.
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.