If there ______ no water or air on the earth, all living things would die.
The child enjoyed _____ up the wooden bricks then knocking them down.
The illness from which Mary is suffering has now been _____ as hepatitis (肝炎).
How can we get this language point _____ to the students.
If the boy had _____ the dog alone it wouldn't have bitten him.
We all knew from the very _____ that the plan would fail.