C:H2和D2
A:16O和18O
B:H2O和D2O
D:24Mg和24Na
____________ is very easy.
My mother is a kind and nice woman. ____ One Sunday night, when I was watching the film Harry Potter very happily. Mother asked me to go to bed. ____ that I didn't move. But for a while, I noticed that she didn't say anything. ____ I was so sad that I went into my room and cried. I thought "I have only two nights in a week to enjoy the TV. ____" The next day she cooked and talked with me as usual. I pretended not to hear, but she didn't mind and told me why she didn't allow me to watch TV ____ Then I understood her. I love my mother.
A. But she is very strict with me.
B. Because she wanted me to have a good rest.
C. Then she got angry and turned off the TV.
D. I love the film so much.
E. Why doesn't mother allow me to watch TV?