阅读理解 Boy: Oh, no!  My book isn't in my backpack! Where is it? Girl: Your book is on the table. Boy: OK. My keys? Where are my keys? Girl: Your keys are in your backpack. Boy: Yes,yes. Where are my pencils? Girl: They're under the bed. Boy: And my hat? Can you see? Girl: It's on the bed. Boy: Where's my pencil case? Girl: It's on the chair. Oh ...no, it isn't. That's my pencil case. 1. His book_______in his backpack. A. is B. isn't C. are D. aren't 2. His pencils are_______the bed. A. on B. in C. to D. under 3. His pencil case_______on the chair. A. is B. are C. isn't D. aren't 4. _______pencil case is on the chair. A. His B. Her C. My D. Your