根据所给首字母或汉语提示，将单词的正确形式写在题后相应的横线上。
1. David is thirteen y_______ old.
2. It is a d__________ question. I can’t answer it.
3.Lisa can p________ the piano very well .
4.Our math teacher is very s_______ with us .
5. Tuesday is the t_______ day of a week.