Gas mask : বিষবাষ্পপ্রতিরোধী মুখোশ;
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Appropriate Prepositions
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Devoted to (মনোযোগী): He is devoted to music.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Follow the footsteps of (পায়ে পায়ে অনুসরণ করা): People always follow the footsteps of some great man.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Slow coach (অলস): You cannot expect much from a slow coach.
Up to (পর্যন্ত) - I have done the exercises up to page 40.