Assistant operator : সহ-চালক;
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Appropriate Prepositions
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.