Speediest : দ্রুত; দ্রুতগতি; বেগবান; বেগপূর্ণ; সবেগ; ত্বরন্বিত; ত্বরিত; অত্যন্তগামী;
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Appropriate Prepositions
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Caution against(সাবধান): Take all cautions against the danger.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Set free (মুক্ত করা): The prisoners were set free.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.