根据句意及首字母（汉语）提示，补全单词。
1. He used to b______ badly in class.
2. John has a______(问题)and I can't help them.
3. I am h______ than I should be.
4. She always feel s______ and tired. She should go to see a doctor.
5. When he was young,he got t______ a hard time living in the countryside.