Upstream : স্রোতের প্রতিকূলে;
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Appropriate Prepositions
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Inquire of, about, into, after (অনুসন্ধান করা): Roma inquired of me about my father’s health. The pope will inquire into the cause of fire. Mehjabin inquired after her friends.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
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Idioms
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Well off (স্বচ্ছল) - Jim and Della were not well off.