Crust of the earth : ভূ-ত্বক;
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Desire for (কামনা): He has no desire for fame.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
For good (চিরদিনের জন্য): He left the house for good.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Round the clock (সমস্ত দিন): He is working round the clock.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.