Fix grammatical errors in this sentence: If the number of elders continues to increase, pertinent problems will definitely escalate.
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The following sentences are correct:
1. The children were very happy to see the children playing in the park.
2. The children were playing in the park.
3. The children were playing in the park.
4. The children were playing in the park.
5. The children were playing in the park.
6. The children were playing in the park.
7. The children were playing in the park.
8. The children were playing in the park.