Wave theory : তরঙ্গতত্ত্ব;
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Appropriate Prepositions
Certain of(নিশ্চিত): Jamal is certain of his success.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Concerned with(জড়িত): She was concerned with such things.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
In vogue (চালু): This custom is not in vogue at present.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.