Nullify : রদ করা, নিষ্ফল করা
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Set free (মুক্ত করা): The prisoners were set free.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.