Amelioration : উনতি, উন্নতি সম্পাদান;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Concerned with(জড়িত): She was concerned with such things.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Play at (খেলা): I do not play at cards.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?