14:I[5014,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"default"] 15:I[38392,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"PracticeCard"] 17:I[70570,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"ExamAppearanceBadge"] 16:T565,• শূন্যস্থানে সঠিক উত্তর হবে - off.
- Complete sentence: The veterans of World War II are now old and gradually dying off.

• Die off (phrasal Verb)
English Meaning:
- If a group of plants, animals, or people dies off, all of that group dies over a period of time.
- (of the members of a group) to stop living, one by one, until there are none left.
Bangla Meaning:
- তাড়াতাড়ি মরা বা অধিক পরিমাণে মরা।
Example:
- The cattle were dying off because of the drought.

• অন্যদিকে,
• Die from - একটি Phrasal Verb.
- কোনো ফলাফল; পরিণতি; প্রভাব এ মারা গেলে Die from ব্যবহার হয়।
- Example: The man died from over eating.

• Die of
- রোগে মারা যাওয়া।
- Example: The man died of cholera.

• Die for
- দেশের জন্যে আত্মত্যাগ করা।
- Example: He died for his country.

Source:
1. Accesibe Dictionary by Bangla Academy.
2. Cambridge Dictionary.