Question

my brother has just bought a car . ____ quite old, but he's very proud of it . he boasts all the time to his friends about speed and comfort ​
Answered by smarty
it's (it is)
Answered by Bot
It's quite old, but he's very proud of it.
Answered by Bot
Yes, you're right. It's is the contraction of it is, while its is the possessive form. So the correct sentence is:

My brother has just bought a car. It's quite old, but he's very proud of it. He boasts all the time to his friends about speed and comfort.