Undeveloped : অপরিণত, অপরিপুষ্ট;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Set free (মুক্ত করা): The prisoners were set free.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.