Speculator : ফটকাবাজ;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Convinced of (আশ্বস্ত): You are convinced of his product.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
Play at (খেলা): I do not play at cards.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Set free (মুক্ত করা): The prisoners were set free.