表达自己有一块橡皮时，应该说：
A：It's a book.
B：I have an eraser.
C：I have a ruler.
翻译句子。
— Jack, I call to tell you I have no time to attend your party next Friday. —What a pity!
在自然界中，动植物的遗体不会永远保留着的原因是（ ）
Don't ____ (spend/take) too much time on computer games, Tim.
