Ⅰ.单项选择(每小题1分，共15分)
1．—Where's my pencil box?
—I ______ know.
A．aren't B．don't C．isn't D．be not
2．—Where are your computer games?
—______ are in my schoolbag.
A．I B．You C．He D．They
3．The pencil box is ______ the bed but the schoolbag is ______ the bed.
A．in；on B．on；on
C．of；under D．on；under
4．The apples are ______ the tree and the bird is ______ the tree.
A．on；in B．in；on C．in；in D．on；on
