Here are the answers to the questions based on your descriptions:
Question 1: Which of the following groups of words is a complete sentence?
Answer: Dad and I went to the basketball game.
Question 2: What is the best way to correct this sentence?
Answer: Emma and Chandra are watching their favorite TV show.
Question 3: Which group of words is a run-on sentence?
Answer: Please help me paint the fence, I'll pay you for your work.
Question 4: What is the best way to correct this run-on sentence?
Answer: My younger brother will have a birthday soon. He will be seven years old.
Question 5: Which sentence in the passage below is a fragment?
Answer: Sentence 4
Question 6: How, if at all, should you correct Sentence 5?
Answer: Add a connecting word.
If you have any further questions or need clarification, feel free to ask!