根据句意及首字母的提示，补全单词。
1. He is 12 years old. He can make his own d
2. When he was young, he got t_____ a hard time living in the countryside.
3. Please do your homework as c_____ as possible.
4. His parents said they would help him to change his a_____ to study.
5. She always feels s ___ . She should go to see a doctor.