Chemicals : রাসায়নিক পদার্থসমূহ;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Infested with (অতিষ্ঠ): The room is infested with rats.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.