根据短文内容，判断正误。

      When you're invited to have dinner at a foreigner's home, please remember the followings.

      At the table, when the hostess(女主人) picks up her napkin, you may pick up yours and put it on your legs.

      If a servant(佣人) passes food around, he will pass the dish to you at your left hand so that you can easily serve yourself with your right hand. Never serve yourself while the dish is on your right. It is then the turn of your neighbour on the right.

      Do not reach across the table to get something in front of someone. That is not polite. Ask him or her to pass it to you.

      There are things in the middle of the table, such as bread, butter, and candies. You shouldn’t take any until the hostess tells the servant to pass them to you.

      Do not leave your seat without saying anything. If you need to leave the table to go to the washroom or do something else, you should say “Excuse me for a moment, please.”

如果一个运动物体不受任何力作用，它将做____运动；如果要使物体的运动状态改变，一定要对物体有____。