听短文，写出所缺部分。

    Hi! My name is Linda! I'm a middle school student. It was____lastSunday．After breakfast, my grandparents went for a walk in the park with their dog．They liked the____air there．My father____with his friend．My mother had to____．What about my brother? He read a book about____in his room．I practiced the piano in the living room．

大气运动最简单的形式是（   ）

—Carrots. They are good for my eyes.

680L=____dm³=____m³

12/（____）=3÷4=（____）/12=15÷____ =____（填小数）