I opened the door as soon as I --- the bell.

"once in a blue moon" means very rarely, infrequently, or almost never. 

In the sentence "Anybody can apply for the post," the word "anybody" functions as an indefinite pronoun.

প্রদত্ত বাক্যটি Superlative degree-তে আছে, যাকে Positive degree-তে রূপান্তর করতে হবে।

নিয়ম:
"the + superlative form + of any" যুক্ত বাক্যকে Positive degree-তে রূপান্তরের গঠন হলো:
No other + noun-এর singular form + verb + as + Adjective-এর positive form + as + প্রদত্ত subject।

বিশ্লেষণ:
• নিয়মানুযায়ী শুরুতে No other এবং এরপর noun wood বসবে।
• এরপর verb burns বসবে।
• "prettiest"-এর positive form হলো "pretty", তাই as pretty as বসবে।
• সবশেষে subject it বসবে।

সঠিক গঠন: No other wood burns as pretty as it.

The word 'Camouflage' means disguise, concealment, or deception.

The correct phrase to fill in the blank is put up with. The completed sentence reads: "While living in poverty, the poet had to put up with a great deal of sufferings." 

Correct Answer: Option D

Past indefinite tense যুক্ত active voice কে passive voice এ রুপান্তর করার নিয়ম-

Structure:
Object এর subject + was/were + verb এর past participle form + by/ + subject এর object

I was surprised at his behaviour.