Answer:
A lot of advice is available for people who want to form new habits for themselves.
Explanation:
Since the antecedent is plural, then the pronoun must be plural. People wishing to form new habits ought to be given a series of advice on how to go about it.
Answer:
Please give a passage.
Explanation:
I can not help you if there is no passage. :(
You would use they or them. You can use third person pronouns.
Answer:
There are a form of power
