—Can I pay the bill by check? —Sorry, sir．But it is the management rules of our hotel that payment ____ be made in cash．

This cake is very sweet. You      a lot of sugar in it. 

You’d better take another flight to New York , for the AA 505 Flight ______ have been cancelled. But you should call the airport to make sure. 

Often he______ sit for hours doing nothing at all when he was in low spirits.

Every time they met, they ____ talk about former classmates they remembered.