In our school library there ____ a number of books on science and the number of them ____ growing larger and larger.

Twenty years _____ passed since I came to this school, but I feel twenty years _____a short time in my life. 

______, he talks a lot about his favorite stars after class．

I, not you , _____ in the wrong. Not I but he _____been invited .

The experts along with the head teacher _____ discusssing JK Rowling’s works that _______ popular among students.