阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。
"What's the matter. mum?"
As soon as I entered the door, I found that my mother was unhappy. It was unusual—she usually 1 and welcomes me with a smile!
"She's dying" mum said sadly.1 2 what she said. The tulip (郁金香) was dying.
A month ago, we moved 3 our new house and mum bought a very beautiful tulip. Mum liked it very much.4 she was free, she would sit in her armchair beside the tulip and enjoy its beautiful colour 5 wonderful smell.
She treated it like a baby and looked after it 6 . She put the tulip by window and moved it from one place to 7 to give the tulip enough sunshine. The first thing she did when she 8 every morning was to water the tulip. Mum also fertilized (施肥) it many times.
She hoped that with great care, the tulip would become more and more beautiful. 9 the tulip was dying because of too much sunshine, water and fertilizer.
It's true that mother loved the tulip. But this kind of love 10 be harmful. Love can sometimes kill what you love.