The correct answer is “tonight.”
Adverbs of time tell us something about the time that something happens. They answer the question "when." These adverbs mainly modify verbs.
The delivery man brought our furniture yesterday. (When did he bring the furniture?)
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.