Answer:
I believe it is diminishes.
Explanation:
Diminishes means to make smaller, to become smaller, or to lessen the authority or dignity of; to put down; to degrade; to abase; to weaken; to nerf (in gaming).
It may be softens, though, so apologies if I am incorrect.
Answer:
1. have
2. were
3. need
4. has, frighten
5. don't, enjoy
6. needs
7. is
8. have, have
9. wants, needs
10. take
11. keep
12. comes, do
13. is (unless series is a plural, then it is are)
14. seem, were
15. are
Answer: I would say c a force that draws in because that's what suction means
Answer: 2. He wants the speech to be memorable.