1. 根据括弧中的提示写出形式和拼写正确的单词 For a number of reasons,

1. 根据括弧中的提示写出形式和拼写正确的单词 For a number of reasons,
1. 根据括弧中的提示写出形式和拼写正确的单词
For a number of reasons, companies are having to work harder to protect their reputation and, by (extend), the environment in which they do business.
2. 根据括弧中的提示写出形式和拼写正确的单词
The federal government appealed for (restrain), insisting that the crisis could be resolved without the use of force.
3. 根据括弧中的提示写出形式和拼写正确的单词
There have been several volcanic (erupt) this year, so the local people have fled that area.
4.根据括弧中的提示写出形式和拼写正确的单词
High unemployment is one of the (period) crises of a capitalist system.