The bell________the end of the period rang, ________our heated discussion.
.So often ______ in recent years that it has almost become a rule.
.The farmer who admitted ______ the tiger was severely punished.
.They ______ be at home. You see, the door is locked from the outside.
.Our English teacher had us all _______our names on a card.
.The ______ student standing at the gate speaks very good Chinese.