某商品的价格p变化会引起其相关商品的需求量x变化,这种变化可表现为两种关系:①,②。在其他条件不变的情况下,下列描述正确的是
Mary is ill today. If she ______ ill, she _______ absent from school.
Mary had promised to give me a ticket for tomorrow. She failed, ______.
The policeman came up to the house, whose door was open, _____ there for a while, and went in.
The boy sat there quietly, ______ eyes were filled with tears.
Look! Here comes my English teacher, ______ a group of students.