Counterintelligence : প্রতিগোয়েন্দাপলিশ;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.