若x2+ky2=(x+2y)(x-2y)，则k值为______．

选择方框内词并用其适当形式填空，使文章意思完整。有两项是多余的。(每空一分)

do; give; book; listen; apple; it; her

 
Victor is seven years old and begins to school this fall（秋天）. He studies hard and 小题1:___________ to his teachers. He is polite（有礼貌的）and has some friends. They all like him. It’s Sunday today. Victor, his sister Tina and his mother stay at home. His mother is 小题2:___________ some housework and he’s watching TV and the girl is doing her homework. At eight thirty his father comes back with a bag of 小题3:____________. The boy likes 小题4:________ very much and wants to eat some. His mother 小题5:____________ him four and says, “Which one do you want, Victor?”
“The biggest（最大的）one，Mum. ”
“What?” says his mother. “You should（应该）be polite and take the smallest one. ”
“Should I tell a lie（撒谎）just to be polite, Mum?” says Victor.