工会会员人数现已超过三百万并且还在增长。

Union ___membership is now over three million and rising.

首先，我们发现我们俱乐部的会员人数实际上在下降。

First of all, we found that our club's ___membership is actually falling.

该公司的会员人数在过去一年中翻了一番。

The company's ___membership has doubled in the past year.