As firm as a rock : অটল; অচল; অনড়;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.