Keep a straight face : হাসি গোপন করা; হাসি সংবরণ করিয়া থাকা;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.