1. (2017·无锡模拟) 单词拼写    

1. （1） There are always soldiers  (守卫) outside the gate of the government buildings.
3. （2） We can  (使……满意) our basic wants more easily than in the past.
5. （3）  (以，凭借) his efforts, Edison successfully made so many useful inventions.
7. （4） The Chinese government has decided to do further research on that  (未知的) areas as soon as possible.