After her son died in a car accident, the old lady would sit at the window, ______ out and _______ in thought.
How can you know whether you will succeed ______ you never try?
It was the fifth time that he ______ to such a meeting.
The villagers, ______ damaged by the flood, were given help by the International Red Cross.
. It is necessary that whoever ______ recently visited the country ______ this kind of test.
His composition won first prize, ______ made him too happy to sleep for nights.