\boxed{\rm{ occur\qquad increase\qquad punish\qquad keep\qquad clean\qquad bring\qquad obey }} Most often traffic problem (a) — in the congested areas where the roads are very narrow. In proportion to our population roads (b) —. There are many unlicensed vehicles which should (c) — under control. The drivers are not willing to (d) — the traffic rules. Irresponsible drivers (e)