O

of course (not) (adv) 

A: Do you give me one of this?

B: Of course.

A: Thanks.

open (adj & v) 

A: You can open the door?

B: A moment, please.

opera (n) 

A: Do you like the opera?

B: No. I don't like.

orange (adj & n)

A: I like the orange in all the forms: juice of orange, ice cream and fruit.

old (adj)

A: My sister is older than I but my brother is the oldest.

onion (n)

A: The onion makes me cry.

B: Me too.

omelette (n) 

A: My mom does one exquisite omelette.

B: Thanks son.

office (n) 

A: The office of my dad is very big.

 

only (adv & adj) 

A:You cannot enter the picture says that it can enter authorized personnel only.