1. are skipping

2. is riding

3. to go; jogging

4. stays

5. brushes

6. does

7. to travel

8. to walk

9.  isn't watching

10. having

11. are you watching

12. eating

13. am playing, playing

14. to buy

15. are jogging

16. are playing

17. Is she taking

18. doesn't want

19. are swimming

20. to buy

1, The girls are skipping at the moment.

2, Nam is riding his bike at present.

3, We'd like going swimming. We don't like going jogging.

4, Mai never stays up late.

5, He brushes his teeth often.

6, Lan always does her tests carefully. 

7, He wants to travel around the world.          

8, Minh'd like walking in the rain.

9, Now Mr. Jones isn't (is not) watching TV.

10, What about do you have some coca cola ?

11, What are you watching now ?

12, What about are you eating some rice now ?

13, I am playing sports now. I love going play sports.

14, Do you want to buy some food for me ?

15, The girls are jogging now.

16, They are playing soccer at the moment.

17, Is she taking some photos at present ?

18, She doesn't want to eat fried rice.

19, They are swimming at presnt.

20, Would you like to buy some food ?