Let's correct the errors and complete the sentences provided:

1. I have been staying at home all weekend. (stay)
- **Correct:** This sentence is correct. It uses the present perfect continuous tense appropriately to describe an action that started in the past and has continued up to the present.

2. My vacation in Hue was wonderful. (be)
- **Correct:** This sentence is correct. It uses the simple past tense to describe a completed action in the past.

3. Last summer I has visited Ngoc Son Temple in Ha Noi. (visit)
- **Correction:** "Last summer I visited Ngoc Son Temple in Ha Noi."
- **Explanation:** The correct use is the simple past tense "visited" instead of "has visited" because the action is completed and there is a specific time mentioned in the past ("last summer").

4. My parents were very tired after the trip. (be)
- **Correct:** This sentence is correct. It uses the simple past tense to describe a completed state in the past.

5. They are talking about their holiday in Hoi An. (talk)
- **Correct:** This sentence is correct. It uses the present continuous tense to describe an ongoing action.

6. Phuong _____ to Hanoi yesterday. (return)
- **Completion:** "Phuong returned to Hanoi yesterday."
- **Explanation:** Use the simple past tense "returned" because the action is completed and there is a specific time mentioned in the past ("yesterday").

7. That (be) ________ better than waiting for two hours.
- **Completion:** "That was better than waiting for two hours."
- **Explanation:** Use the simple past tense "was" to compare a completed situation against another past event.

Please let me know if you need further explanations!