Reactivity : রিঅ্যাকটিবিটি;
Related Words
reactivate  reactivated  reactivating  reactivity  rectified  See Words Also In
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Devoted to (মনোযোগী): He is devoted to music.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Out of date (সেকেলে): This fashion is out of date.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
To the point (সঠিক) - The boy answered the question to the point.