Catalyst : অনুঘটক;
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Appropriate Prepositions
Admit of(স্থান করা, সুযোগপ্রাপ্ত হওয়া): His offence admits of no explanation.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Caution against(সাবধান): Take all cautions against the danger.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Without fail (অবশ্যই) - You must attend the meeting without fail.