Take another look at the sentence:

Theodore bought beautiful roses for Glenda, his date. Because he did not have a vase, he rinsed out a peanut butter jar. After Theodore __________ Glenda's reaction to the arrangement, he realized that he had not made a favorable first impression.

The sentence requires the past tense of see, an irregular verb. Saw is the simple past form.

Verb Simple Present Simple Past Past Participle
see see(s) saw seen

Seen, the form you chose, requires that an auxiliary verb comes before it. Before you continue, review the rules for irregular verbs.

Go back to the sentence to try again.

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