This is the _____ tree in the garden.
This is the _____ tree in the garden.
Explanation
The word "the" before the blank indicates a superlative degree.
"Tallest" is the superlative form of "tall", used to show the highest degree among all trees.
The word "the" before the blank indicates a superlative degree.
"Tallest" is the superlative form of "tall", used to show the highest degree among all trees.