Choose the best answer from the four options marked A, B, C or D to complete each numbered gap in the passage below. 

If you (1)_____ to be walking in your local park tomorrow and you find an abandoned book with a label inside (2)_____ 'Read and Release me', don't just treat it as a joke. You've probably come (3)_____ an example of 'book-crossing', a book-sharing movement started in 2001 by American software developer Ron Hornbaker, whose stated aim is to 'make the (4)_____ world a library'.  Book-crossers 'release' books (5)_____ by passing them on to friends, or else by leaving  them in public places for others to pick up, or 'catch', and then read, before they (6)_____ turn release them back 'into the wild'. (7)_____ a book has been 'caught', the person finding it is encouraged to record the event by logging on to the book-crossing website and entering the book's ID number written on the label. That (8)_____ , both the original owner and subsequent readers of the book can keep track of its progress. Over half a million people worldwide participate in book-crossing, 'releasing' books in a (9)_____ range of locations including cafés, airports, bus stations, telephone boxes and even underwater in public fountains. Often a book is left in a place (10)_____ is relevant to its title or content: Agatha Christie's Murder on the Orient Express on a train, for example, or an archeology book in a museum.

If you (1)_____ to be walking in your local park tomorrow