根据中文意思完成句子。
1. Wang Bing often writes _______ (电子邮件) to his friends.
2. Is there a supermarket in the small _______ (城镇)?
3. What subjects do you _______ (学习) at school?
4. Does he _______ (通常) play football?
5. I hear David swims _______ (快) .
6. -What's that on the desk?
-Oh, it's a birthday present _______ (来自) my Dad.
7. Does Tom play basketball _______ (好) ?
8. -Are you ______ (忙) now?
-Yes, I am.
试判断此位错的类型？若为刃型位错，试求出半原子面的晶面指数及插入方向的晶向指数。