Tunnel : ভূগর্ভস্থ সুড়ঙ্গ;
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.