The future continuous tense describes an action that will be in progress at a time in the future.
To form the future continuous tense, we add -ing to the end of the main verb and add the auxiliary verb will be (not conjugated) before it.
I will be sleeping over next week.
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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.