1. I have a lot of  __________ ( money) with me.

2. He wants __________ ( be) a basketball player.

3. Jet Lee is a successful  __________ ( act) .

4. __________ (thief) are afraid of the police.

5. Mr Wang __________ ( work) in a school. He is a __________ ( teach) .

数据库中，每个事务都感觉不到系统中其他事务在并发地执行，这一特性称为事务的 ______。