1. Choose: You ____ cross the railway. It is dangerous.

2. Choose: Passengers ____ buy a ticket.

3. Choose: The train leaves ____ 8 o'clock.

4. Choose: Our trip is ____ Thursday.

5. Choose: The air is dirty ____ cars make smoke.

6. Choose: If we use buses, there ____ less traffic.

7. Choose: Electric cars can ____ charged at stations.

8. Choose: The metro is ____ than a bus.

9. Write 4 safety rules for a metro station. Use must, mustn't and should.

10. Write a short suggestion (4 sentences) for a clean and safe school trip. Use because and If.