Respuesta:
1. Don't (figure out) to carry this box because it's very heavy.
2. Sami wanted to (figure out) why the teacher didn't give him a high mark.
3. If you study engineering, you could (become) an inventor.
4. Have you got the correct tools to (attach) this light to the wall?
5. At what temperature does water (turn into) ice?
6. Ben couldn't (figure out) how his cat had got onto the roof.