A hard nut to crack : কঠিন সমস্যা; যে লোককে সহজে টলানো যায় না;
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Out of order (বিকল): The elevator was out of order.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Up to (পর্যন্ত) - I have done the exercises up to page 40.