* In this sentence, it’s is short for it has.
( What’s valuable — the watch or the band? Better to clarify by inserting the specific
information.
) Their is possessive, not called for in the sentence.
- Mr. Sievers is male and needs a masculine pronoun (him).
_ You’re = you are, but the sentence needs the possessive pronoun your.
= He’s = he is, but the sentence calls for the possessive pronoun his.
+ Who’s = who is. The sentence needs to read “I do not care who is to blame . . .”
[ What should be fixed, the band or the blood pressure? Clarify by changing it to the band.
{ Here the possessive its is needed.
] A store is singular (one store), so its (singular) is what you want.