吸烟会缩短你的寿命。

Smoking ___shortens your life.

或许我们可以把自由日缩短到半天，用另外半天去观光。

Maybe we could ___shorten the free day to half a day and use the other half for sightseeing.

在冬天，白天逐渐变短。

In winter, the days gradually ___shorten.