Mental arithmetic : মানসাঙ্ক;
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Appropriate Prepositions
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Hope for (আশা করা): Let us hope for the best.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.