高铁每节车厢都有两间厕所，只有当两间厕所的门都关上时（每扇门的插销都相当于一个开关），车厢中指示牌内的指示灯才会发光提示旅客“厕所有人”。下列所示电路图能实现上述目标的是（ ）
—What are you doing now ? —I am ____ pictures. A. draw B. drawing C. drew
ZhangPeng ____ his homework now. A. did B. does C. is doing
I was very grateful ____ the dog. A. with B. for C. to
Did Lucy ____ the noodles yesterday ? cooking B. cook C. cooked
I played the piano ____. A. tomorrow B. last weekend C. every day
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