4.

Choose the correct form of the modifier: When my sister is thinking, she sits __________.

A.) silent

*B.) silently

5.
Choose the correct form of the modifier: I was _________ excited about going to the concert than I usually am.

A.) little

*B.) less

C.) least

Both are correct.

Thank you

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Silently

To choose the correct form of the modifier in question 4 and question 5, we need to consider the adverb form that appropriately modifies the verb in each sentence.

In question 4, the verb is "sits." The adverb form that describes how she sits is "silently." Therefore, the correct form of the modifier is "silently." Option B, "silently," is the correct answer.

In question 5, the verb is "excited." The adverb form that describes the intensity of excitement is "less." Therefore, the correct form of the modifier is "less." Option B, "less," is the correct answer.