Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Of course (অবশ্যই): Of course, you know what that meant.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.