Let's analyze the patterns in each sequence to determine the next word:

1. Sequence: 67, 100, 67, 100, ...
Pattern: Alternating between 67 and 100.
Next word: 67

2. Sequence: 35, 35, 231, 231, ...
Pattern: Repeating each number twice.
Next word: 35

3. Sequence: 97, 79, 79, 97, ...
Pattern: Alternating between 97 and 79, with each number repeating twice.
Next word: 79

4. Sequence: 53, 53, 63, 53, ...
Pattern: Repeating 53 twice, then 63 once, then 53 again.
Next word: 53

So, the next words are:
1. 67
2. 35
3. 79
4. 53