Here are the sentences based on the given clues:

5. People expect that the new metro system can solve traffic problems.

6. The Internet provides us with various information and learning materials.

7. The traffic system in Ho Chi Minh City has been upgraded over the last five years.

8. If you join this summer camp, you will learn to use traditional farming tools.

9. Children in the cities should avoid playing soccer on the streets.

10. Our group agreed to present the differences between nuclear family and extended family last week.