Unobservedly : অগোচরে;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Convinced of (আশ্বস্ত): You are convinced of his product.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Call in question (সন্দেহ করা): No one can call his honesty in question.
In no time (শীঘ্র): He will finish the work in no time.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.