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'.
Complete the second sentence so that it has the similar meaning to the first sentence. Use the word given. Do not change the word. Write your answer on your answer sheet.
It's possible that someone stole your purse when we were in the restaurant. (might)