With the worldwide oil crisis, the price of oil has been raised ______ 15%

The days are gone ________ physical strength was all you needed to make a living[ ]

Whether the soup smells _____ or not doesn’t make any difference to me, as I can’t smell _____ due to my bad cold.

in her spare time

There is so much noise in the yard that I can’t ________ my attention on my work. [ ]