because of smb, smth

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at — We use at with times: at 5 o clock at 11.45 at midnight at lunch time at the week end/at week ends at Christmas/at Easter at the moment/at present at the same time at the age of We use at in the following situations: at the back/at the top (of… … Combinatory dictionary
keep an eye on — (smth or smb) watch (as in take care of something) Will you keep an eye on the baby while I go to the store. (from Idioms in Speech) to watch carefully; to look after; to observe (from a distance) so that the party under observation is unaware of … Idioms and examples

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