Have I correctly used 'every' and 'lacks' in the sentence?
If every schoolchild lacks a proper healthy diet, how can he/she be fully competitive in or outside the school?
In that sentence, I would use "a" instead of "every", and I would omit the definite article before "school".
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In that sentence, I would use "a" instead of "every", and I would omit the definite article before "school".