我从杯子的数量推断他在等客人。

I ___inferred from the number of cups that he was expecting visitors.

从以上内容可以推断出，土地退化的主要原因因地区而异。

From the above, it can be ___inferred that the major causes of land degradation vary according to regions.

从她的语气，我可以推断出她对这一决定并不满意。

From her tone of voice, I could ___infer that she was not pleased with the decision.