如图所示的电路中，电源电压保持不变，闭合开关S，将滑片P向左移动，电压表示数____ （选填“变大”、“变小”或“不变，），电流表示数____ （选填“变大”、“变小”或“不变”）．

用特殊疑问词或短语填空

（1）—____ do children of migrants(流动人员子女) go to school?

         —By school bus or walk.

（2）— ____ does it take you to get home from work every day?

         —About twenty minutes.

（3）—____ is it from your uncle's home to your grandma's?

         —It's about three kilometers.

（4）—____ is twenty and fifty?

         —It's seventy

（5）—I walk to school. ____ about you, Jane?

         —I ride my bike.