A should be used before countable nouns that talk about one person or thing.
Re-write the sentences carefully using a where possible.
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Alberto is reading book.CorrectIncorrect
He has recently published paper on the subject.CorrectIncorrect
I need paper to write letter on.CorrectIncorrect
He gave me box of my favourite chocolates for my birthday.CorrectIncorrect
She loves chocolate.CorrectIncorrect
We went for walk after lunch.CorrectIncorrect
He has desk which is made of wood.CorrectIncorrect
I am going to have my hair cut tomorrow.CorrectIncorrect
There is blonde hair on your shirt!CorrectIncorrect
I need glass of water.CorrectIncorrect