Write in the missing words, and then look at the text in Lesson 1.
填入所缺的词，然后查看第1课的课文。
Write in the missing words, and then look at the text in Lesson 31.
填入所缺的单词，然后查看第31课的课文。
Write in the missing words, and then look at the text in Lesson 3.
填入所缺的词，然后查看第3课的课文。
Listen and write down the missing words.
听录音，写出所缺单词。
Listen and write down the missing words.
听录音，写出所缺单词。
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