单项选择题
Why is their mother unhappy（）
A．Their father is unable to keep his promise. B．Their father is going on a vacation without her. C．Their father isn’t telling her the truth. D．Their father doesn’t want to travel abroad.
单项选择题 Why is the man afraid he won’t be able to attend the seminar（）
单项选择题 What does the woman mean（）
