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Fill In The Blanks (Quantity Noun)
Could I have a ________ of chocolate?
Explanation and memory cue
The phrase 'a bar of chocolate' is the correct and common collocation in English to refer to a solid rectangular piece of chocolate. 'Block' is less common, 'slice' is used for items that can be sliced like cake or bread, and 'piece' is more general but less specific than 'bar'.