Chemical reaction : রাসায়নিক বিক্রিয়া;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.