根据句意将括号中的字母组成正确的单词并填空。

1.(seerar)   A: Is this an         ?

                  B: No, it isn't. It's a pencil sharpener.

2.(pesll)     A: How do you          pen?

                 B: P-E-N, pen.

3.(htta)     A: What's         ?

                B: It's a book.

4.(kacpback) A: Is that your         ?

                     B: Yes, it is.

5.(Enligsh)     A: What's this in         ?

                     B. It's a telephone.

下列关于留置权的表达，不正确的有( )。

A．以留置权人占有留置物为成立要件

B．以留置权人占有留置物为存续要件

C．留置权人失去对留置物的占有，留置权消灭

D．留置权具有物上代位性