Could someone fix these problems?

Sincerity is the keystone (a)---------success
Which preposition should we use and why?
(1)to,or
(2)of

Insincere people can never go a long way(b)-------the world.
Which preposition should we use and why?
(1)in, or
(2)to

1 Answer
May 12, 2018

Sincerity is the keystone to success.
Insincere people can never go a long way in the world.

Explanation:

For the first sentence, the use of the word 'to' relates to the proposition that approaches a certain condition. In this case, it is success. If the word 'of' was used, then the expression indicates an inexact state.

For the second sentence, the word 'in' shows that the people all live within the same world rather than 'to' a world. If the word 'to' was used then they are doing something towards the world rather than being present in it.