How To Stop Procrastinating

In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word. Procrastinate

If earth stops rotating

There are p intermediate stations on a railway line from one terminus to another . In how many ways a train can stop at 3 of these intermediate stations if no two of those stopping stations are to be consecutive ?

How will stopping potential of a photoelectric cell change on decreasing the intensity of light incident on the cell ?