As we know, water is very important _______ us.A. of B. to C. on
— ______ are the students? —They are on the playground.
—______ on the desk?—There are some pictures.
There is _______big desk in our classroom. _______desk is for our teacher.
There _________a lot of fish in the water.
—Where’s my cat, Bill? —There aren’t any cats here, ___________ there’s a little dog.