Prehistory : প্রাগৈতিহাসিক বিষয় বা যুগ;
Related Words
precatory  prehistoric  prehistory  projector  purgatory  See Words Also In
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Careful of (সতর্ক): He is very careful of his fault.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
In no time (শীঘ্র): He will finish the work in no time.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.