1. How many competitors（竞赛者）can win medals in the game?
2. The explorers have to be extremely tough（坚强的）to endure（忍受）the climate and other hardships.
3. He won the champion（冠军）in the National Games.
4. Those whose parents are missing must wait for two years for a court to declare（宣布）their parents dead.
5. The material is of poor quality（质量）.
