1 . It is r________ to assume that he knew beforehand that this would happen. (fair, practical and sensible) (根据首字母单词拼写)

2 . Over the next 10 years, he was ________（专心致志的）in finding the cure for the disease. （根据汉语提示单词拼写）

3 . The koala is u__________ to Australia, which can’t be found in other countries.

4 . We are________ (满足的) to live quietly in the country. （根据汉语提示单词拼写）

5 . It is much better to say”I’m sorry,but I think you may be m______________”rather than”You’re wrong!”

6 . With no adults around, it’s d___for children to swim in the river. （根据首字母补全句子）