At ones wits end : হতভম্ব; ভ্যাবাচাকা;
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Greed for (লোভ): He has an indomitable greed for wealth.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Slow coach (অলস): You cannot expect much from a slow coach.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Up to (পর্যন্ত) - I have done the exercises up to page 40.