Надо вставить а/аn,the the park keeper found some litter in __ park.first he found __ crisp packet. __ packet was in __ middle of__ footbal pitch.then he found __ old comic. __ comic was under __ three hear __ lake.then he found some orange peel behind __ fence next to __ bus stop.

 the park keeper found some litter in _а_ park
he found _аn_ crisp packet. __ packet was in _a_ middle
of_an_ footbal pitch.then he found _an_ old comic. _a_
comic was under _a_ three hear _a_ lake.then he found
some orange peel behind _a_ fence next to _a_ bus stop.

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