51. 应该允许我们为自己设计校服。
We should be ______ to design school uniforms _______ourselves.
52. 在春节吃饺子是中国的传统习俗。
Eating dumplings in ______ ______ is a Chinese traditional custom.
53. 你本应该完成作业，但是你没有。
You should ______ ______ your homework, but you didn’t.
54. 红十字会给遭受洪水的人们提供了一些食物和衣服。
People suffered from the flood were provided _____ some food and clothes ______the Red Cross.
55. 他说等她一回来就把礼物送给她。
He said that he would give her the present______ ______ ______ she came back.