You’re＿＿＿＿＿your time trying to persuade him. He’ll never join us.  

--- “What do you think of the service here?”　　--- “Oh, ______. We couldn’t have found a better place.”

. Jay Chou is _______ that teenagers are all crazy about him.

With the development of science and technology，there is no doubt ________ Chinese astronauts will land on the moon in the near future. 

 Parents always _______ great improvement in study ______their children.