Straight angle : সরলকোণ;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Fair and square (সৎ): The learned persons should be fair and square.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.