Base metal : নিকৃষ্ট ধাতু;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At home (comfortable— আরাম) He feels at home in Dhaka now.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.