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A _______ is a block of dense ice.
Our _______ is changing due to human actions.
The buffalo move across the Savannah.
The abbot lived in the _________.
In many countries, _______ is a major source of income.
______ is an extra-hazardous occupation.
This medication comes in a _______.
The rain water was passed through an underground _______.
An expert in or student of astronomy.