11. This book is very interesting. I have read it twice (so) 
This book is so fascinating that I have read it twice.
13. We should reduce the amount of garbage. We can help to protect the environment (so that) 
We reduce the amount of garbage so that we can help to protect the environment.
14. This morning it rained very hard. We all came to school on time (although)
Although it rained very hard this morning, we all came to school on time.
15. the bird covered the nest with her wings. She wanted to protect her eggs (in order to)
The bird covered the nest with her wings in order to protect her eggs.