【2013广西玉林】Many houses ______ in the earthquake of April 20, 2013 in Ya’an. A. is destroyed B. are destroyed C was destroyed D. were destroyed
This is the most beautiful park I have _____ visited.
Xi’an is a city with many places of interest and __ tourists come here every year.
—_____ you _____ your homework yet? —Yes, I _____ it ten minutes ago.
It’s necessary for you _____ exercise every day.
—I _______ here since I was five years old.