Bolt from the blue : বিনা মেঘে বজ্রাঘাত; সম্পূর্ণ অপ্রত্যাশিত জিনিস;
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Appropriate Prepositions
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Indulge in (আসক্ত): You should not indulge in social media.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
In no time (শীঘ্র): He will finish the work in no time.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.