我们不能去朱莉娅的聚会，因为我们那个周末要离开。

We can't go to Julia's party ___because we're going away that weekend.

我这么做是因为卡洛斯告诉我的。

I did it ___because Carlos told me to.

我会在7:30到你家，因为我之前有个约会。

I will be at your house at 7:30 ___because I have an appointment before.