Sympathetic ink : অদৃশ্য কালি;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.