Catalyst : অনুঘটক;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
For good (চিরদিনের জন্য): He left the house for good.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.