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).