The most viable alternative is to invest in renewable energies.

This is a viable alternative.

Alternative algebra is a branch of mathematics that studies non-necessarily associative algebraic structures.

Alternative medicine has gained popularity in recent years.

The alternative hypothesis is the rival of the null hypothesis.

We can alternatively go to the cinema or stay at home to watch a movie.

The possible alternatives were considered.

The alternatives are varied and interesting.

Alternative medicines are becoming increasingly popular.