他看着空荡荡的冰箱，推测妻子可能忘记去买菜了。

He looked at the empty fridge, ___surmising that his wife might have forgotten to buy groceries.

从她匆忙离开的样子，我推测她遇到了紧急情况。

From the way she left in a hurry, I ___surmised she had an emergency.