---Do you know___________ in Ya’an? --- On the 20th of April,2013.
What would you do if you ________ on the moon?
—Whose bike is this? —It must belong_____. I have seen him riding it.
This is my school ________ is near the post office.
Her son _________ Coke, but now he ________ milk.
The teacher told us to write ____ composition in class.