可能是亚历克斯打的电话。

It ___might ___have been Alex who called.

雨可能在午餐前就停了。

The rain ___might ___have stopped by lunchtime.

首先，你可能一直在想你必须去体育俱乐部或某个地方，通过艰苦锻炼来保持健康。

First of all, you ___might ___have been thinking you have to go to a sports club or somewhere and exercise very hard to keep fit.