The correct answer is “are.”
A helping verb is a verb that comes before the main verb in a sentence. Helping verbs are verbs that, just like their name, help the main verb in a sentence by giving it more meaning. Helping verbs also show different ideas.
She is watching t.v.
Notice how the word “is” helps the main verb “watching” and gives it meaning.
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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.