1. The
players' helmets need to be repainted so that
they will be ready to be used at practice on Sunday. - correct. they correctly refers to palyers' helmets
2. Some people believe that the benefits of a healthy diet outweigh
that of regular exercise. - benefits is plural and so should be "those"
Some people believe that the benefits of a healthy diet outweigh those of regular exercise.3. We finally chose the coffee table towards the back of the
store,
which we thought would complement our living room furniture. - which incorrectly refers to store. It is not the store that would complement the living room furniture.
We finally chose the coffee table towards the back of the store, because we thought it would complement our living room furniture - "it" correctly refers to coffee table. This is stratight from Manhattan SC book.
4. Jim may not be elected CEO by the board because he does not meet
their standards. - board is singular subject. Hence the pronoun should be singular
Jim may not be elected CEO by the board because he does not meet its standards.5. We finally returned all the books to the
library,
which we left at the front desk. - which incorrectly refers to library. It is not the library that was left at the front desk.
We finally returned all the books, leaving them at the library's front desk. "them" correctly refers to books. This is stratight from Manhattan SC book.