Under lock and key : তালাবদ্ধ;
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
To the point (সঠিক) - The boy answered the question to the point.