---It has been ages ________ I last saw you. --- Yes. And it will be long ______ we meet again.
This is the best way ______ I have thought of ______ the problem.
Particular attention must be paid ______ welfare, especially in the poor area.
At this time tomorrow ______ over the Atlantic.
—That must have been a lot of work. —Yeah, it us three days to finish it.
______ many times, he finally understood it.