—Hurry up！Alice and Sue are waiting for you at the school gate.

—Oh！I thought they ________ without me.

A．went

B．are going

C．have gone

D．had gone

电热饮水机有加热和保温两种工作状态（由机内温控开关S₀自动控制，S闭合，S₀断开时为保温状态）从说明书上收集到如下数据如表，电路原理图如图所示．

（1）求电阻R₂的阻值．

（2）求电热饮水机在加热状态下的工作电流．

（3）求饮水机在保温状态下工作10min所消耗的电能是多少？