单项选择题 It is very（）to pick your teeth at the table.

单项选择题 It is not your business to reprove the waiter for（）conduct；that belongs to your host.

单项选择题 We must make a claim on you for（）with regard to this shipment，for it is not equal to the samples submited.

单项选择题 What is obvious difference between European and American table manner？（）

单项选择题 How to use a kinfe and fork？（）