Ok so where's the questions, id be happy to help
Answer:
1: If you travel to the future you can ruin something and make everything change.
2:Traveling to the past can help us make a better future.
Explanation:
Hope these help!
I sharpened my skills under the mentorship of my coach.
You need a noun to complete this sentence, and mentorship is the only noun here - the rest of the words are adjectives.