Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Capable of(সক্ষম): He is capable of doing it.
Careless of(অসতর্ক): Do not be careless of your health.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Look at (তাকানো): Students look at the blackboard.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.