单项选择题 The eye contact is one of the most important parts of communication，but the amount of proper eye contact varies from culture to culture，so which of the followings is not true？（）

单项选择题 When all or part of an order cannot be processed because the merchandise is temporarily out of stock or has been discontinued，which of the followings should not be done？（）

单项选择题 In Canada，direct eye contacting is acceptable when you want to convey（）and（）.