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O

Obey

Obey - To follow orders.

Example: The dog obeyed its owner.


Observe

Observe - To watch carefully.

Example: Scientists observe animals in the wild.


Occur

Occur - To happen.

Example: The event will occur next week.


Offer

Offer - To present for acceptance.

Example: He offered his help.


Official

Official - Approved by authority.

Example: The official document was signed.


Opinion

Opinion - A personal view.

Example: Everyone has a different opinion.


Opposite

Opposite - Completely different.

Example: The opposite of hot is cold.


Option

Option - A choice.

Example: You have the option to stay or leave.


Organize

Organize - To arrange in order.

Example: She organized her desk neatly.


Overcome

Overcome - To conquer.

Example: They overcame many obstacles.


Overflow

Overflow - To flow over the edge.

Example: The river overflowed after the storm.


Oxygen

Oxygen - A gas we breathe.

Example: Plants produce oxygen.