1) 1. Will our planet be in danger in the future
2. Will our planet be or not in danger in the future
3. Our planet will be in danger in the future, wont it
4. When will our planet be in danger
5. What will be in danger in the future

2) 1. Have they watched a very interesting film
2. Have they watched a very interesting or a very boring film
3. They have watched a very interesting film, havent they
4. What have they watched
5. Who has watched a very interesting film