Here is the item:
Giselle dreaded attending her U.S. Government class. Whenever Professor Duncan called on her, Giselle __________ in her chair; she could not open her mouth, let alone answer one of his questions.

You chose froze, the simple past form. You are the verb master!

Verb Simple
Present
Simple
Past
Past
Participle
freeze freeze(s) froze frozen

Go to the next item.