Catalyst : অনুঘটক;
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Die of (রোগে মরা): Many people died of cholera.
Infested with (অতিষ্ঠ): The room is infested with rats.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.