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—Be careful! Don't forget you are on a ladder.

—But you are holding it for me, nothing ________.

A．worry about 

B．to worry about

C．is worried about 

D．worrying about

--- Be careful! Don’t forget you are on a ladder.

   --- But you are holding it for me, nothing         .

       A．worry about     B．to worry about C．is worried about      D．worrying about

―Be careful! Don’t forget you are on a ladder.

― But you are holding it for me, nothing ______.

A．worry about            B．to worry about        C．is worried about      D．worrying about

---Be careful! Don’t forget you are on a ladder.

---But you are holding it for me, nothing         .

A．to be worried about                                     B．worrying about

C．being worried about                                    D．to worry about

--- Be careful! Don’t forget you are on a ladder.

   --- But you are holding it for me, nothing         .

       A．worry about     B．to worry about C．is worried about      D．worrying about

--- Be careful! Don’t forget you are on a ladder.
--- But you are holding it for me, nothing         .