---What’s the matter with John? He has been sitting there for hours.---A postcard from his father ______ an attack of home-sickness in him.
Antarctic __________ we know very little is covered withthick ice all the year round.
The train __________ she was travelling was late.
—Howdo you like the book? —It's quite different from __________ I read last month.
Is this the museum __________ you visited the other day?
I refuse to accept the blame for something __________ was someone else's fault.