1. A new subway is being built around the city.
2. That old building won't be used from now on.
3. Energy consumption will be reduced as much as possible.
4. Solar energy is not only free but also inexhaustible.
5. How would languages be learnt in the future?
6. It took us 4 hours traveling to Halong Bay
7. You can use the automated machine if you ask for permission.
8. Running a solar power doesn't cost much.
9. Tom used to live with his parents.
10. It took us 4 hours to travel to Halong Bay.
11. It was a comedy. However, we didn't find it funny.
12. I find the ending of "The Lion King" moving.
13. In spite of being sick, Lan still went to school.
14. It is predicted that all the areas of Asia would be urbanized by 2050.
15. This is the first time Mary has ever been to Viet Nam
16. There are many places of interest in London.
17. Would you mind sending this letter to my boss?
18. My grandmother often used to live in the countryside when she was young.
19. I used to walk to school with my friends when I was a child.
20. How about going to the cinema this Saturday?
21. The film didn't receive good review from critics. However, many people went to see it.