Time and tide wait for none. a no one can stop the onward march of time. b, we should not waste a single moment in vain. c we should make proper use of every single moment of time. d the students should understand the value of time. It is a matter of great regret that some of the students pass their valuable time in Facebook. e they kill their time. f they cannot prepare their lessons well. g they always have a poor preparation for their examination. h they cannot do well in the examination. i they do not stop wasting time. j they continue to waste their time using Facebook till it is too late for them.