Key-stone : খিলানোর মধ্য প্রস্তর; মূলকেন্দ্র
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Devoted to (মনোযোগী): He is devoted to music.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.