单项选择题
It seemed (incredible) that he had been there a week already.（）
A．right B．unbelievable C．obvious D．unclear
单项选择题 The rules are to (rigid) to allow for human error.（）
单项选择题 The police will need to keep a (wary) eye on this area of town.（）
单项选择题 Come out, or I'll (bust) the door down.（）
