Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Enter into (কোনো কিছুতে আবদ্ধ হওয়া): pma entered into a new agreement.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Look at (তাকানো): Students look at the blackboard.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At times (মাঝে মাঝে): He at times comes here.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Worthy of (যোগ্য) - He is worthy of a good job.