Catalytic : অনুঘটক প্রক্রিয়া সংক্রান্ত;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Conscious of(সচেতন): I am conscious of my deficiencies.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.