写出下列单词的缩写形式或完全形式。
1. is not __________________
2. September __________________
3. second __________________
4. kilogram __________________
5. number __________________
6. let's __________________
7. can't __________________
8. I'd __________________
1. isn't  2. Sept. / Sep.  3. 2nd  4. kg  5. No.  6. let us  7. cannot / can not  8. I would
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