Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
For good (চিরদিনের জন্য): He left the house for good.