Prophylactics : প্রতিষেধক;
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Catch at(ধরা): A drowning man catches at a straw.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.