22. They never knew what would happen to the world in a hundred years.

21. Sam wanted to know where he could travel for holiday. As he was busy searching the Internet, he became interested in how different countries were.

20. They can be planted at the sides of the road.

19. Young trees must be looked after well.

18. Forests help to keep water from running away, so drought does not often happen.

17. The toys were made in China.

16. Tea is grown in Southeast China.

15. English is spoken by more than 400 million people as their first language.

14. More than 6000 languages are spoken in the world today.

13. She has nothing to say.