完型填空
    When you were young, who rode you around on the back of his bike? Who played football and flew kites with you in the park? Who helped you 1 your first difficult maths problem? Who taught you the difference between 2? Your dad. Now it is your turn to do something for him. This Sunday, June 18, is Father's day. So why not do something 3 to thank your dad?
    The idea of Father's Day came from a(n)4lady called Sonora Smart Dodd in 1909. She wanted a special day to honor(纪念)her father. He raised(抚养)six children by himself5 his wife died during the birth of their 6_ child. Dodd thought there needed to be a day to honor great and loving dads. Her father was born7 , so she chose to hold the first Father's Day celebration on his birthday in 1910. In 1924, US president Calvin Coolidge 8the idea of a national Father's Day. Finally, in 1966, the third Sunday in June was made Father's Day.
    There are many ways to 9 your love and thanks. For example, send him a greeting card or a red rose. If he has a 10 , cover his desktop with words like “I love you, Dad.”

在等级法的生物分类中，____是基本的分类单位，分类单位越小，共同特征____．

操场上有408名学生，老师的人数是学生人数的 $\frac{1}{8}$ 。操场上师生一共有多少人？

She looks      the window and sees the plant.

作家莫言获诺贝尔奖的小说《蛙》有以下描写：“1962年秋季，高密东北三万亩地瓜获得了空前的大丰收。跟我们闹了三年别扭、几乎是颗粒无收的土地，又恢复了它宽厚仁慈、慷慨奉献的本性。那年的地瓜，平均亩产超过了万斤。”出现此现象的原因是（    ）