It _________ rain this afternoon, but I am not sure.

We used to work in the same office and we _________ have coffee together.

---- Is Ann knocking at the door?--- No, it ______ be Ann. She has gone to Beijing. 

House owners        keep their gardens in a neat and orderly state according to the regulations.

 — Are you going to Beijing by air?— It’s fast, but expensive. So I’m not sure. I _____ take a train.