Answer:
I have not encountered a wise person but I would recognise him /her as a wise person if he/she would always speak the truth.
explaining why or how about your topic or saying goodbye to everybody I hope to see you soon.
They can't pass the exam unless they "study" hard.
Answer:
B.
the deeper message of a literary work
Explanation:
Using the formula:

Which is, 3.14 x 2^2 (radius is half of diameter)
Which equals 12.56.