What's your hobby? ____________

如下图，AB和CD互相____，____是CD的垂线，____是垂足．

When I handed the report to John, he said that George was the person _______.

小明利用电压表测量未知电阻的阻力．实验过程中，与未知电阻并联的电压表的示数如图甲所示，与未知电阻串联的电源表的示数如图乙所示，则电压表的示数为____V，电流表的示数为____A，此时所测量的未知电阻的阻值为____Ω．

.Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon ________a break at midday.