Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Aware of(অবগত): I am not aware of his dishonesty.
Deal with (কারো সাথে ব্যবহার বা আচরণ করা): Shahid can deal well with the customers.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.
Without fail (অবশ্যই) - You must attend the meeting without fail.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.