Keep a straight face : হাসি গোপন করা; হাসি সংবরণ করিয়া থাকা;
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Short of (অপর্যাপ্ত): I am running short of money.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In vogue (চালু): This custom is not in vogue at present.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.