Time, by its very nature, is fleeting. a, time once gone is gone forever. b the sincere people realize the value of time. c, not everyone is aware of the value of time. d, it is seen that many of us waste time. e, we realize the significance of lost time when it is too late. f, we suffer in life. g, all of us should make the best use of time. h, proper time management is the key to success in student life. i, we find that an ideal student is the one who makes the best use of time. j, a lazy student fails to make the grade as he kills time. k, the teachers advise their students not to waste time. l, they warn the students against their addiction to social networking sites and gaming. m, students should follow the advice of their teachers. n, they will suffer in the long run.