Explanation:

- Portia claims that even if she (1) were to live as long as Sibylla, she would die as (2) chaste as Diana.

- The word "worries" is in the present tense, which suggests an ongoing state of concern or anxiety about a current situation.

- She can only be claimed (3) under the manner specified by her father's will, indicating a condition or stipulation that must be met.

- The correct answer for (4) is present tense, as it aligns with the continuous nature of her concern about the situation not being resolved.

- (5) The casket test refers to a challenge or puzzle designed to find a suitor, implying a difficult or seemingly impossible task.

worries is the correct choice for blank No. 4 because it naturally fits the context of continuous concern.