Here are the correct matches for the sentences:

1. Why do we need to preserve the natural wonders of Viet Nam?
**G. To ensure that the future generation can also see and experience them.**

2. How can we know the schedule of the metro?
**F. Google it!**

3. You really must come over Thien Mu Pagoda after visiting Hue Citadel.
**C. Thank you. I will.**

4. What should we do to reduce the air pollution in Ha Noi?
**D. Use a bike or take the bus.**

5. What do you think about nuclear families?
**B. I don't like the idea and I think the extended one is the best.**

6. I really hope you have a good time in Nha Trang.
**E. That's good to know.**

7. What is the best way to get around?
**A. I suggest using public transportation every day.**

8. What would happen if we didn't preserve our traditions?
**H. Our cultural identities would be lost.**