--Who          shoes with adjustable heels invented         ?

--Jayce Coziar and Jamie Ellsworth．

A．was, by              B．were, for            C．were, by            D．was, for

A. are, with　　　B. is, with　　　　C. are, have　　　D. is, having

-What are the shoes with adjustable heels used for?

-They are used to ________ the style of the shoes．

1. A.
   changed
2. B.
   changing
3. C.
   changes
4. D.
   change