Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Due to (কারণে): His absence is due to illness.
Free from (মুক্ত): He is now free from danger.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.