Nelson Mandela devoted all his life to the struggle of the African people and      of every nation that seeks freedom．

 I have no idea ________ is better, so I took _______ of them.

 I turned to bookshops and libraries looking for information and found _______.

Catherine bought a postcard of the place she was visiting, addressed______to _____and then posted it at the nearby post office．

An average of just 18.75cm of rain fell last year, making ______ the driest year since California became a state in 1850.