单项选择题
A．Five may be too many.
B．The decision must be made soon.
C．It would be smart to take more.
D．Four People are enrolled in them.
单项选择题 An artist's choice of shapes and colors indicates that he believes them to be（）
单项选择题 If there is a shortage of any product, prices of that product go up.（）
单项选择题 Hi, this is Mike. I'm either away from my desk, or on the phone. Please leave a message and I'll call you back as soon as possible.（）