Oligocene : নবজীবীয় স্তর;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Argue against (বিপক্ষে বলা): She argued against the bill.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Play at (খেলা): I do not play at cards.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Well off (স্বচ্ছল) - Jim and Della were not well off.