Catalyst : অনুঘটক;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Dwell in (বাস করা): He dwells in a tall apartment.
Enter into (কোনো কিছুতে আবদ্ধ হওয়া): pma entered into a new agreement.
Identical with (একই ধরণের): You are identical with your sister.
Independent of (স্বাধীন): They are independent of my health.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Round the clock (সমস্ত দিন): He is working round the clock.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.