1．________，the headmaster rose to indicate that the conversation was________.
A．At an end; in an end B．In the end; at an end
C．In an end; at the end D．At an end; in the end
答案与解析：B in the end 意为“最后；终于”，at an end 意为“结束；终结”，常用做表语。
2．After the explosion，the roads are full of ________ people leaving the city.
A．afraid B．frightened
C．frightening D．scary
