Heterogeneity : বিষমসত্ত্বতা; বর্ণসঙ্করতা; দোআঁশলা;
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Appropriate Prepositions
Consist of(গঠিত হওয়া): The committee consists of ten members.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Free from (মুক্ত): He is now free from danger.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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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.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.