Can you check the following statements for me, please?

1) What image does Hamlet use to express the fear of something after death ?
The image of the "unknown country" from where no traveller comes back
2)What prevents men from committing suicide? According to Hamlet a sort of moral conscience prevents us from taking our own lives.
3) How are conscience and consciousness related to one another? (is the preposition correct?)
4) What image does Hamlet use to explain that the cast of thought turns the native hue of resolution pale and sick? The image of the face which loses its red color and becomes pale when the body is sick
5)What was a "quietus"? It was a statement which released an accountant from the responsibility for the accounts he was working on. (It is at peace. There is no further dispute on the exact amount. Is there a better and easier was of expressing this concept???)
6) The natural color of resolution is made to look sick by the paleness of reflection (is the preposition "to" correct?)
7) Hamlet has so far failed to carry out (???) his revenge on Cladius
8) Hamlet shows sympathy to Gertrude (is there a better verb?). The ghost pleads for sympathy (is there a better synonym) to be shown to Gertude
9) At his mother's age there was no chance of her passion overcoming her good sense (or no chance for her passion to overcome her good sense???)
10) He was made redundant. He was fired/sacked/dismissed (are they all correct?)
11) He made her drop the milkshake because he pushed her (is make correct?)
12) She poured the milkshake over him (is there a synonym for pour over???)
Thanks for the help

#1 , 2, 3 are fine.

#4. This is not a complete sentence. There are clauses but no main verb.

The image of the face which loses its red color and becomes pale when the body is sick
#5. A better definition for quietus is anything which ends or settles an argument or dispute.

#6 Yes, using "to look" there would be correct.

#7 is good except you mispelled Claudius.

#8 is ok.

#9. "for her passion" would be better.

#10. yes, all of those are correct.

#11. He made her - is correct

#12. "spilled the milkshake on him" would be better.