My mother _____ all the cleaning for my family, but recently she has been too busy teaching to do it. 

I’m afraid we must hurry—the train        at six o’clock.

Nothing but some ancient Chinese coins _______ in the sunken ship since they began the exploration.

She can’t ______ having nothing to do.

—Where are the guests to be from tomorrow?—Many an American boy and many a British girl as well as the teachers to he present.