Sinse так как не на протяжении пол часа а с""
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It is twelve o'clock.
It is half past nine.
It is quater past seven.
It is three o'clock.
It is quater to eight.
It is half past ten.
A sugar/ a bread / a grape / an onion
Тут все зависит от буквы в начале слова. Если гласная то пишем an
On yhe fouth of July
in the afternoon
at night