吾尝终日而思矣，____；____，不如登高之博见也。（《荀子·劝学》）
要测量标有“2.5V”字样小灯泡的额定功率．现有器材：电压恒为6V的电源，一只电压表，标有“50Ω 1A”的滑动变阻器A和标有“×Ω1A”的滑动变阻器B（阻值模糊不清），实验过程如下：
Not until we saw the manager did we know that the bank ________the company for the purpose of reducing its borrowings.
