—________ we finish the work before class, Jack?—No, we_________ . We can do it after class.

When we worked in the same office，we _______ often have coffee together.

— You used to 　　　　 the bus to school, didn’t you?— Yes, I did. However, I am used to 　　　　 to school now.

—It’s hard to believe that Jack ________ have fought with the policeman.—Yes.If one ________ ask for trouble, it can't be helped.

 -- Must I return the book by the end of next month?--    . You can keep it as long as you like.