Despite facing a challenging situation, she remains ________.

♦ As cool as a cucumber
English Meaning: very calm and controlled.
Bangla Meaning: শান্ত এবং ধীরস্থির। 

Ex. Sentence: My boss is as cool as a cucumber even when he speaks in front of hundreds of people.
Bangla Meaning: আমার তত্ত্বাবধায়ক / বস শত শত লোকের সামনে কথা বলার সময়ও শান্ত এবং ধীরস্থির থাকেন৷

Complete sentence: Despite facing a challenging situation, she remains as calm as a cucumber.

অন্য অপশন,
- As per
English Meaning: in accordance with.
Bangla Meaning: অনুসারে। 

- As to
English Meaning: about.
Bangla Meaning: সম্বন্ধে। 

- At bottom
English Meaning: in a basic way.
Bangla Meaning: মূলত। 

Source: Lecture.