1 . 用方框中单词的适当形式完成下列句子， 每个单词只能用一次。

disappoint          origin             regular       patient        formal        explore          various

1. People change their mind for a ___________ of reasons.
2. Our school _________ invites university professors to give lectures on science.
3. To his _________, the basketball team lost the championship game.
4. On __________ occasions, you can wear anything you want, like T-shirts and jeans.
5. Their _________ idea was to fix their old computer, but they decided to buy a new one instead.
6. As a doctor, when working with _________, my efforts are centered on helping them overcome illness.
7. After _________ the old part of the town in the morning, we made our way to the modern part after lunch.