根据提示用适当的介词完成句子。
1.—Where are my books?
—They're o________ the sofa.
2.—Where is your pen?
—It's i________ the pencil case.
3.—Where are my shoes?
—They're u________ the bed.
4.—Where is my cat?
—It's b________ the door.
5.—Where is the telephone?
—It's n________ to the sofa.
6.—Where are the CDs?
—They're on the desk, b________ the books and the TV.
7. Their bookcase is n________ to the table.
8.—Is there a desk b________ the bed?
—Yes, there's a desk next to the bed.
