Fill in the blank with the appropriate Modal from the options given below:

He _________ not ask for a raise for fear of losing his job.

dare

The correct option to fill in the blank is "dare".

The complete sentence is: He dare not ask for a raise for fear of losing his job.

Here's why:

• dare expresses hesitation or lack of courage due to fear or risk. In this case, it conveys that the employee feels apprehensive about asking for a raise because of the potential consequence of losing his job.
• need doesn't accurately fit the context. While the employee might "need" a raise, the sentence emphasizes his fear of asking, not the necessity of getting one.
• should implies obligation or advisability, which doesn't align with the fear motivating the employee's inaction.
• must emphasizes strong necessity or obligation, contradicting the hesitation implied by the fear of losing his job.

Therefore, "He dare not ask for a raise for fear of losing his job" best captures the employee's internal conflict between wanting a raise and fearing the potential negative outcome.