Sentence Correction (SC) | Re: Running is one of the activities that greatly increase cardiovascular

ForOne of the sentences follow the below rule:

1. One of the Xs that/who <plural>
2. One of the Xs <singular>
3. only One of the Xs <singular>
4. only One of the Xs that/who <plural>
5. "the" only One of the Xs that/who <singular>
...

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