Biquadratic : চতুর্ঘাত;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
On the whole (মোটের ওপর): On the whole, his conduct is good.