What power does a news media personality not have when he/she moderates a televised debate? they determine which candidates are present. they ensure that candidates can make rebuttals to which they are entitled. they ensure that participants do not go over their allotted time. they write the debate questions?

The power that a news media personality not have when he/she moderates a televised debate is: They determine which candidates are present
A news mmedia personality could only have the power to give the debate invitation to the candidates. Whether they decided to accept it or not, it's all entirely determined by the candidates

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

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

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