这是一种低脂肪的黄油替代品。

It's a low-fat ___alternative to butter.

恐怕我别无选择，只能请你离开。

I'm afraid I have no ___alternative but to ask you to leave.

另一个选择是乘缆车或索道铁路上山。

Another ___alternative is to go up the mountain by chairlifts or funicular-railway.