“吃就吃新鲜的!”这是人们经常挂在嘴边的一句话。在通常情况下这句话没有错:对大多数食品而言,越新鲜,其营养价值越高,味道越好,颜色越诱人;长期放置,其色香味形等会变差。但对黄花菜、海蜇、木耳等食品而言,“新鲜”往往意味着可能存在导致食物中毒的隐患。上述情况说明
--Who______ it be that is knocking at the door? --It ______ be Father, but I’m not sure.
Judging from his______ expression, this problem must be quite ______.
Listen! Do you hear someone _____ for help?
--How is your cousin, Kate? --She broke her leg and ______ medical treatment since.
--Mom, may I play computer games just for a while? --______! Dad is writing his paper.