Keep a straight face : হাসি গোপন করা; হাসি সংবরণ করিয়া থাকা;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.