Without provocation : অকারণ; অকারণে;
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Appropriate Prepositions
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Slow coach (অলস): You cannot expect much from a slow coach.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.