Right angles : সমকোণ;
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Appropriate Prepositions
Attain to (লাভ করা): He will not attain to his objective so soon.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Without fail (অবশ্যই) - You must attend the meeting without fail.