As firm as a rock : অটল; অচল; অনড়;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At home (comfortable— আরাম) He feels at home in Dhaka now.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Set something right (ঠিক করা)— He will set the machine right.