A:马拉车的力
B:钢绳吊起重物的力
C:太阳与地球之间的吸引力
D:两个异名磁极之间的吸引力
—What are you thinking about?
— .I'm just looking at the sky.
My grandma's birthday is on October sixth. (对画线部分提问)
____ ____your grandma's birthday?