—Look at the sign! —Oh, I see.We _______ waste water.

—Is that Lucy’s cousin, Anna?—No, it ______ her. She has gone to Paris.

You can’t imagine that a well-behaved gentleman __________ be so rude to a lady.

If prices rise too high, the government has to do something _________ it. 

 ------What kind of house do you want to have? Something big ? ------Well, it _______ be big.—That’s not important.