He noticed that a river of liquid rock was coming towards him. It would ________ him completely, but he managed to escape just in time.
--- Who broke the window? --- I _____.
—Turn off the TV, Jack. ____your homework now? —Mum, just ten more minutes, please.
—What do you think we can do for our aged parents? —You ________ do anything except to be with them and be yourself.
His lack of professional knowledge _______for the failure of the experiment.
Not believing their eyes, the visitors on the spot _______ the flying plane, doing some most difficult and dangerous tricks in the sky.