I invited the twins ____ my birthday party. [ ]

What do you think of the movie Avatar？— Interesting. It is _______ again.

Due to the widespread ________ of this medical technology, more diseases can be discovered and treated at an early stage.

Is this Mr. White’s office, Mary?— Yes, _____.

Do you know the boy ________ is sitting next to Jim? Yes. He is Jim’s friend. They are celebrating his ________ birthday.