---Is this book Betty's? ----Yes , it's ________. 

—More and more people come to visit Mount Huangshan—That's true. It has become the_______ of Anhui.

 ---- Could you tell me how to write an application letter?  ---- With pleasure. Remember that the letter should be written in the formal _______.

– Can you ______Chinese, Tony?_ Yes ,but to _____ the truth, I could hardly ______ a word when I _____ in front of the whole school yesterday.

The computer was invented in the 20th