All at once : আচমকা; হঠাৎ; সহসা; আকস্মিক; তত্ক্ষণাৎ; কথা নেই বার্তা নেই;; at once;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Look for (খোঁজা): I was looking for the lost phone.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Up to (পর্যন্ত) - I have done the exercises up to page 40.