Kids don’t learn their native language , but they become fluent in them within a few years.
If you work hard, you will _____ a good teacher.
--- 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.