Unchallenged : আপত্তি করা হয় নাই এমন, গৃহীত;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Competent for(যোগ্য): He is not competent for the post.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Look at (তাকানো): Students look at the blackboard.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Set free (মুক্ত করা): The prisoners were set free.
Slow coach (অলস): You cannot expect much from a slow coach.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.