I ________ him in time, otherwise he would have fallen off the bike.

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

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

We        the opportunity to go to France, had it not been for Mary’s help.

 This car looks like mine , yet it isn''t . Whose ____ .