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.