Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.