閱讀下面短文，按要求完成各小題。

　　Nick and his friends were talking about things that can bring them luck. “I have a lucky red pen,” said Andy. “I have a lucky coin,” said Peter. “Every time I take a test, I carry my lucky coin.” Nick thought for a moment, and said, “My blue socks.” “Blue socks?” the boys were surprised and asked together. Nick said that every time he wore his

　　blue socks to school before a test, he got a good mark.

　　The next day Nick had a Chinese test. He was sad because he couldn’t find his blue socks. “Mom!” shouted Nick. “Where are my blue socks? I have a Chinese test today, and I need to wear them.”

　　“Don’t be silly,” Nick’s mom said. “They need to be washed.” “When I wear them, I get a good grade. ” Nick said.

　　“Did you prepare for your test?” asked Mom.

　　“Yes.”

　　“Then don’t worry about it. Just do your best.” Mom encouraged

　　A few days later, Nick’s teacher told him that he got 95 in his test. Nick was so excited that he couldn’t wait to tell Mom he did well in his test. Mom said, “It wasn’t the blue socks that made you success. In fact, it was made by yourself.”

　　71. Who could get luck from a red pen?(根據(jù)短文內(nèi)容回答問題)

　　72. Why was Nick sad the next day?(根據(jù)短文內(nèi)容回答問題)

　　73. Was Nick’s good mark made by the blue socks or by himself?(根據(jù)短文內(nèi)容回答問題)

　　74. 從文中找出與下面句子中畫線部分意思最接近的短語。

　　Nick was so excited that he couldn’t wait to tell Mom he did well in his test.

　　75. In this passage, the underlined word “it” refers to ________.