The invention of blocks of type that could be used to repeat printing of words, individual letters and seals was developed in China using .

Bi Sheng

Explanation:

The invention of blocks of type that could be used to repeat printing of words, individual letters and seals was developed in China using Bi Sheng .

always include the steps and/or background required to get to the final answer. let’s other people understand and solve future problems on their own.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.