1. That story sounds interesting.
2. He frequently visits his friend.
3. During summer vacation, I visited my aunt in Beijing.
4. He came to this city on a cold morning in February.
5. December is the twelfth month of the year.
6. This is their second son.
7. Let me see your picture when we return to school.
8. He stayed there for a week.
9. He will stay there for a week.
10. How long will you be in Hong Kong for?
11. Show him your radio.
12. I returned home late last night.
13. I have been taking a walk with him for a long time.
14. How is the weather today? It's very windy.
15. how was the weather yesterday?
16. May I ask you some questions regarding vacations?
17. China is famous for the Great Wall.
18. That boy can speak French.
19. He was thinking of other things at the time.
20. We have decided to spend our vacation in Shanghai.