用所给词的正确形式填空。

1. The little boy fell off the tree and _____ (hurt) himself seriously.

2. She died after a long _____ (ill).

3. Doing eye exercises _____ ( be) good for your eyes.

4. Reading _____ (make)me happy.

5.There are many _____ (different)between the countryside and the big city.

由于（）是在教育的实际情况下进行的。所以它所得结果比较接近于实际。