Angle of reflection : প্রতিফলন কোণ;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Certain of(নিশ্চিত): Jamal is certain of his success.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Hope for (আশা করা): Let us hope for the best.
Play on (বাজানো): They play on the piano.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Far and wide (সর্বত্র): His fame spread far and wide.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.