Correct answer: B

To lose your cool means to become angry or upset and stop controlling your emotional reaction. In this idiom, “cool” means calmness or self-control.

Correct answer: D

Alex loses his cool because his irritation turns into an angry reaction. Simply feeling annoyed is not always enough: the expression suggests that the person is no longer reacting calmly.

Correct answer: C

The idiom normally uses a possessive word: my, your, his, her, our, or their. Because the sentence is about Maya, the correct form is “she lost her cool.

Correct answer: A

The past tense of “lose” is “lost.” Use “lost my cool” when the angry reaction happened in the past.

Correct answer: B

Complete sentence:The customer lost his cool with the receptionist over the long delay.

“Lose your cool with someone” identifies the person involved in the angry reaction. “Lose your cool over something” identifies the problem or situation that caused it.

Correct answer: C

“Nearly” and “almost” mean that something came close to happening. If you nearly lost your cool, you felt close to reacting angrily, but you may have stopped yourself in time.

Correct answer: D

Complete answer: “At first, I tried to keep my cool. But after the third accusation, I lost my cool and spoke much more sharply than usual.”

“Keep my cool” means remain calm. “Lost my cool” means that the speaker stopped reacting calmly. The contrast between the two expressions makes the situation clear.