1. Thank you for inviting me to your birthday party.
2. Are you interested in history or geography?
3. Look. That factory is releasing black smoke into the air.
4. Planting more trees can make the land greener, the sky bluer and the water cleaner.
5. Just keep the door open like this. Our little dog Sam will come in and out.
6. Trees can exchange water and nutrition between each other.
7. Do you know if that tiger is in danger? He has fallen into a trap.
8. Simon takes a few pieces of paper from the drawer. Do you what they are?