Under lock and key : তালাবদ্ধ;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.