1. First aid is a t___________ form of help given to someone who suddenly falls ill or gets injured before a doctor can be found.
2. The ______________(最重要的，不可缺少的)character of the town has been destroyed by the new road.
3. The rise in inflation was just one _____________(症状，征兆)of the poor state of the economy.
4. The Yangtze river is a natural_________________(屏障，障碍) to the north-east.
5. There is a wide_____________(变化，多样性) of patterns to choose from.
6. He took off his wet clothes and s_____________ the water out.