根据括号内的标点提示，把所给的单词组成句子。

1. is the my bed backpack under (.)

    ________________________________

2. parents your at are home (?)

    ________________________________

3. not that is his notebook (.)

    ________________________________

4. CDs where Jim's are (?)

    ________________________________

5. photo my family is here (.)

    ________________________________

虚拟存储器实际上是一种设计技巧，使主存物理容量得到扩大。