Present Perfect - HAVE OR HAS?

I have/has bought three books from this shop.

My dad still have/has his old car.

Ben and Anna has/have found a really good computer game.

You have/has spent all your money.

A new music shop has/have opened. I can't wait.

She have/has been to the cinema four times this week.

Doctors have/has cured many deadly diseases.

James has/have not finished his homework yet.

Yes, there has/have been a war in the United States.

You have/has grown since the last time I saw you.