The correct word is 'few' to describe the leaves left on trees after autumn.
The correct word to fill in the blank is few. The sentence should read: 'Few leaves were left on the trees after autumn.'
In autumn, most trees shed their leaves, so the word 'few' indicates a small number of leaves remaining on the trees.
This usage highlights the limited quantity of leaves left, emphasizing the natural process of leaf shedding during autumn.
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