A question about the usage of definite article.

[Infin1ty]

Hello everyone,

I have a question about the usage of the definite article.

Comrade Zhao is chairman of the trade union of the English Department.

Comrade Zhao is the chairman of the trade union of the English Department.

Please tell me which sentence is correct, the sentence with the definite article or without it?
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Today is a gift, that's why we call it the present.

[Mister Micawber]

.
Both are OK and in common use.
.
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Native English teacher at Mister Micawber's

[Infin1ty]

Thank you Mister Micawber.
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Today is a gift, that's why we call it the present.