—Who _______the plan?

—Sidney did．

A．made             B．makes            C．is making              D．make

Mrs. Turner enjoys ________ new models of robots.

A．making            B．makes              C．make              D．made

Are bikes ________ of metal?

[　　]

Are bikes ________ of metal?

[　　]

Julia Morgan has just finished ____ her last movie.

A．make             B．makes            C．made             D．making