We like elephants , because they are interesting . And we like dogs , ______.

ing to the school rules, no student_______ go out of school without the permission of the teachers.

How much difficulty did you have this problem— None. It’s quite easy.

— I have come to say good-by.— What time_____?[ ]

I met your boss in the street this morning.—Ah You _____ be joking. He flew to Europe yesterday!