(is) admired by ... ,(is) white, and ... (is) by Jack


Senior Member
I have written down three sentences below.

(1) John is very talented and (is) admired by everyone in the town.

(2) The first pencil on the table is black and the second one (is) white.

(3) The first box is made by John and the second one (is) by Jack.

Is it optional to use the second "is"? Please help me. Thanks a lot.
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