从方框中选用合适的词，并用其适当形式填空，使句子通顺, 每词限用一次。

sad  excited  leaf   fog   loud

Please speak a bit _________ . We can’t hear you at all.
When spring comes, grass and  ________  of the tree begin to turn green.
Never drive on such  _________  days.
________ , most of the crops died because of the heavy snow.
It is  _________  to be the chairperson of the club.