Fossilization : অশ্মীকরণ; অশ্মীভবন;
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Appropriate Prepositions
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Play on (বাজানো): They play on the piano.
Relation with (সম্পর্ক): I have no relation with the culprit.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
For good (চিরদিনের জন্য): He left the house for good.
To the point (সঠিক) - The boy answered the question to the point.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.