给定一篇文章，请将其中的逗号全部改为句号，并将段落合并成一篇文章。


The weather is beautiful today, but it is supposed to rain tomorrow. I hope it doesn't ruin our plans. We were planning a picnic in the park.
The weather is beautiful today. It is supposed to rain tomorrow. I hope it doesn't ruin our plans. We were planning a picnic in the park.