Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
We showed great pity to the poor old man, for ________ life was hard in the past.
I think it was ________ surprise that he finished the work without ________ rest.
The moment ______Leo will never forget is ______he joined the Air Force
I prefer to work here because salaries are higher here than ______in my country.
The girl ___on the ground ___to me that she had ____the book on the shelf.