A.forB.toC.aboutD.atI have come to say goodbye( )you.……

单项选择题You can find ( )kinds of shoes in this store.

单项选择题His performance( )the mathematics exam is not very good.

单项选择题No one saw the thief when he entered( )the buliding.

单项选择题( )child enjoys Christmas.

单项选择题If the corporation wants to increase its (),it must reduce operating expense.