Head mistress : প্রধান শিক্ষিকা;
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Appropriate Prepositions
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Look for (খোঁজা): I was looking for the lost phone.
Play with (খেলা করা/ মজা করা): I shall not play with him.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.