根据句意和汉语注释，写出单词的正确形式。
1. Tim’s brother is so ___________(care) that he often forgets to do his homework.
2. Those ___________(visit) will stay in our school for two days.
3. It’s very important for us to keep             (save).
4. They were too tired to walk any            (far).
5. Mary can learn Japanese by _________________(she).