Answer: a. active
Explanation: An active close (e.g. requesting a meeting, announcing your next phone call, etc.) to a cover letter is a demonstration of your initiative of maintaining contact and following up on the hiring process.
He started to observe, reconnoiter means to make a military observation of something so he throughly examined the corridors.
Answer:implying that one thing is the other thing
Explanation: a word or phrase is applied to another thing figuratively, to highlight a charactersitic of the first. eg: black sheep of the family