Answer:
Below is the rewritten correct sentence:
THERE are many people who think that dancing is a great way to get exercise and still have fun. Many dance teachers make videos you can buy to practice dancing in YOUR own home. Once you're THROUGH learning the basics, IT'S much easier to learn more advanced moves.
Step-by-step explanation:
The words THERE, YOUR, THROUGH and IT'S are all the correct words that are used to complete the passage as they best serve the function of adding adequate meaning to the context of the sentence.