Unit 2 words

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Across
  1. 2. a very difficult problem
  2. 3. 破损的
  3. 5. 兴趣
  4. 6. 标志
  5. 7. the same meaning as"trip/travel"
Down
  1. 1. n.志愿者 v.只愿做……
  2. 2. a person can't hear anything
  3. 3. a person can see't anything
  4. 4. 信件
  5. 7. the same meaning as"happiness"