26. Jerry, why ______ you leave your things on the floor like this?

18. She ______ stop whomever she met to tell the story about her Ah Mao.

16. He had already learned the news. I ______ the trouble to phone him about it.

10. The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.

20. This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.

He insisted _____ with her.

-- Is it necessary that he ____ to London but to New York?
-- I think so, but the problem is ____ he has refused to.

Sir, you ______be sitting in this waiting-room. It is for women and children only.

When we were young, every evening my brother and I ______ stay at home waiting for our mother to come back from work.

----Who______ it be that is knocking at the door?  
----It ______ be Father, but I’m not sure.