IN or ON?

IN or ON 1

Choose the option you think is correct

I'm afraid this item is OUT OF stock. = I'm afraid we don't have this item __________ stock.
ON
IN
John is away __________ business in the States at the moment.
ON
IN
Click __________ this link to go to the payment page.
ON
IN
__________ general, I think it's a good plan.
ON
IN
__________ the whole, I think it's a good idea.
ON
IN
Her birthday is __________ October 6th.
IN
ON
We're going __________ holiday at the end of the month.
IN
ON
Pete lives __________ the third floor.
ON
IN
Jane is always __________ the phone to her boyfriend.
ON
IN
It costs R$35 __________ average.
IN
ON