Sometimes mail arrives at the post office, and it is impossible to deliver the mail. Perhaps there is a wrong address and no return address. The post office cannot just throw this mail away, so this becomes "dead mail." This "dead mail" is sent to one of the U.S. Postal Service's dead mail offices in Atlanta, New York, Philadelphia, St. Paul, or San Francisco. Seventy-five million pieces of mail can end up in the dead mail office in one year.
The staff of the dead mail offices have a variety of ways to deal with all of these pieces of dead mail. First of all, they look for clues that can help them deliver the mail; they open packages in the hope that something inside will show where the package came from or is going to. Dead mail will also be listed on a computer so that people can call in and check to see if a missing item is there.
However, all of this mail cannot simply be stored forever; there is just too much of it. When a lot of dead mail has piled up, the dead mail offices hold public auctions. Every three months, the public is invited in and bins containing items found in dead mail packages are sold to the highest bidder.

Rice is eaten by Vietnamese people every day. It is often grown in tropical countries such as Vietnam, Thailand and Malaysia. People have been growing rice (46) thousands of years. In the beginning, the seeds are planted in special beds to grow into young rice plants. Then the small plants are taken to (47) covered with muddy water called paddies. The fields of rice look very beautiful. After 3 or 5 months, the rice is ready to be picked. People often drain away water before (48) rice. Eating rice is a special action in the world so people don't use spoons or forks to enjoy bowls of rice. (49) , they use two short sticks (50) as chopsticks to put rice into their mouths.