Our math teacher ______ in our school for 20 years and he _____ here when he was 23 years old.
Turn on the TV, and there is _________.
Fish sleep _____ their eyes ______.
Are you _____ in these _____story books?
It is _______ unusual thing for us to find ________ UFO.
The city in Shandong has become famous__________kites.