Feathers are very light, we say "as light as a feather".
—What made you so __________?—John's not listening to my advice.
There will be a concert in the stadium this week-end, but I don't know who will __________ the band.
—How are your children in their new home?—Fine. The good thing is that they've __________ very easily to new environments.
—I'm going on a holiday tomorrow. — __________________________________________________
I'd like to start my own business that's __________ I'd do if I had the money.