Complete the following sentence with a (compound) word derived f

Complete the following sentence with a (compound) word derived from the one(s) given in bracket.

He was hopeful that the next round of talks would be more（ ）. (produce)

本题考查形容词以及be+adj的用法。

根据空格前边的be more可知空格处需要形容词。因此答案为productive。

句意：他希望下一轮会谈将更有成效。