Wave theory : তরঙ্গতত্ত্ব;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Remind of (স্মরণ করিয়ে দেওয়া): He reminded me of his request to lend him some money.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Lump sum (এক কালীন) — He gave us lump sum money.
On the wane (হ্রাসমান): His fame is on the wane now.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.