Keep a straight face : হাসি গোপন করা; হাসি সংবরণ করিয়া থাকা;
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Plead for (ওকালতি করা): He pleads for justice.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At a discount (অনাদৃত) Female education is no longer at a discount now.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.