按要求写句子。
1. This is my pencil. (改为复数句)
_______ _______ my pencils.
2. My backpack is on the chair. (对画线部分提问)
_______ _______ your backpack?
3. That is her pencil case. (改为一般疑问句)
_______ _______ her pencil case?
4. His telephone number is 110 - 7856. (对画线部分提问)
_______ _______ his telephone number?
5. Bob has seven baseballs. (对画线部分提问)
_______ _______ baseballs does Bob have?