_there's smoke,there's fire.

A. Where
B. What
C. How
D. Why

Some people who are very _and successful in their fields.

A. learner
B. different
C. conversely
D. intelligent

_speaking the language everyday.

A. finish
B. paractice
C. cannot
D. suggest

They do not _on the book or the teacher.

A. later
B. depend
C. focus
D. shown

She once tried _learn french.

A. in
B. for
C. on
D. at

_is a pleasure for us to attend the olympic.

A. it
B. that
C. this
D. what

翻译下列句子这是我的爸爸。___________________________________________________

英汉互译duck_________

在MySQL中，为了加快数据表的查询速度，可以建立_______来实现。

请简述什么是索引。