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)
【正确答案】：PRODUCTIVE
【题目解析】：
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。