成本是选择这个建筑商的决定性因素。

Cost was the ___deciding ___factor in choosing this builder.

个人认为，教师质量、学校声誉和设施应该是父母决定的关键因素。

Personally, I think the quality of teachers, school reputation and facilities should be the ___deciding ___factors for parents.

天气将是我们野餐计划的决定性因素。

The weather will be the ___deciding ___factor for our picnic plans.