Mike Perham,a 17-year-old British teenager, finished his solo round-the-world sailboat trip last week, becoming the youngest person in the world to that.
--- 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.