He proved himself a true gentleman and the beauty of his _____ was seen at its best when he worked with others.

They do have  a different          to the  problem of overpopulation.

Her father works as a ______ in a hotel and her mother a ______ in a private company. 

Now that he has missed his      ，he’ll have to wait for the next round．

—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes, it’s a common ______ to tip waiter in a restaurant.