1. Farmers use different kinds of soil c_____ methods to protect their land from being damaged by farming
    and the forces of nature.
2. Today the Siberian tiger is not the only endangered species which is on the brink of e_____.
3. A person's age no longer tells you anything about his/her social position, m_____ or health.
4. Seventy-five American students were s_____ to visit China.
5. The Youth Summit was aimed at i_____ understanding and friendship between the students of the two
    countries.
6. What can we do to help the tigers in their _____ (斗争) for survival?
7. The polluted air in the city is badly _____ (危及) the health of the residents.
8. While most people use little white lies to make life easier, the _____ (大多数) of Americans care about
    honesty in both public and personal life.
9. "We need _____ (家具) for our living-room," says John Ross.
10. In most of the places, spring is an _____ (理想的) season for holidays.