1 . To my regret, my allowance was not sufficient _________ (afford) my mom's birthday gift. (所给词的适当形式填空)

2 . Those poor and needy teenagers were excited to find a shop at the corner where they could buy ________(afford)priced bikes.

3 . The obvious one is money; eating out once or twice a week may be ________ (afford) but doing this most days adds up. There could be an even________ (high) cost on your health.(所给词的适当形式填空)