You are _________ to have such a good teacher.

--- Why is Jack always playing?--- He has no ________ of time.

Jade is the highest award in Chinese culture and medals are the most important prize in Olympics, so medals with jade is the perfect _________ to present the Olympics in Beijing.

—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.

It’s obvious that his ______ to the problem is wrong, so we’d better try another way to solve it.