Playing on a frozen sports field sounds like a lot of fun. Isn’t it risky, ______?

At first the institute refused to purchase(购买)  the  experiment  instrument,  but  this decision was ______ changed.

A football suddenly flew over our head and it ______ missed hitting a child playing nearby.

Contrary to popular belief, taking a walk immediately after meals doesn’t _______ do good to our health.

Everything seemed to be going ______for the first two days after I moved to New York.