Right angled : সমকোণী;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Easy of (সরল): The teacher is easy of approach.
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Idioms
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Up to (পর্যন্ত) - I have done the exercises up to page 40.